Thornburg Mortgage Securities Trust 2006-6 – ‘10-K/A’ for 12/31/06

On:  Tuesday, 5/27/08, at 4:16pm ET   ·   For:  12/31/06   ·   Accession #:  1056404-8-1233   ·   File #:  333-135481-10

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Amendment to Annual Report   —   Form 10-K
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K/A      Amendment to Annual Report                             9±    41K 
 3: EX-33       ABS - Report of Compliance with Servicing Criteria     2±    13K 
 4: EX-33       ABS - Report of Compliance with Servicing Criteria     2±    15K 
 5: EX-33       ABS - Report of Compliance with Servicing Criteria     2±    16K 
 6: EX-33       ABS - Report of Compliance with Servicing Criteria     1     12K 
 7: EX-33       ABS - Report of Compliance with Servicing Criteria     3±    19K 
 8: EX-33       ABS - Report of Compliance with Servicing Criteria     9±    49K 
 9: EX-33       ABS - Report of Compliance with Servicing Criteria     3±    19K 
10: EX-33       ABS - Report of Compliance with Servicing Criteria     3±    19K 
11: EX-34       ABS - Attestation Report on Assessment of              2±    14K 
                          Compliance with Servicing Criteria                     
12: EX-34       ABS - Attestation Report on Assessment of              3±    18K 
                          Compliance with Servicing Criteria                     
13: EX-34       ABS - Attestation Report on Assessment of              2±    16K 
                          Compliance with Servicing Criteria                     
14: EX-34       ABS - Attestation Report on Assessment of              2±    14K 
                          Compliance with Servicing Criteria                     
15: EX-34       ABS - Attestation Report on Assessment of              2±    14K 
                          Compliance with Servicing Criteria                     
16: EX-34       ABS - Attestation Report on Assessment of              2±    13K 
                          Compliance with Servicing Criteria                     
17: EX-34       ABS - Attestation Report on Assessment of              2±    16K 
                          Compliance with Servicing Criteria                     
18: EX-34       ABS - Attestation Report on Assessment of              2±    16K 
                          Compliance with Servicing Criteria                     
19: EX-35       ABS - Servicer Compliance Statement                    1     10K 
20: EX-35       ABS - Servicer Compliance Statement                    1     11K 
21: EX-35       ABS - Servicer Compliance Statement                    1     12K 
22: EX-35       ABS - Servicer Compliance Statement                    1     12K 
 2: EX-31       Certification -- Sarbanes-Oxley Act - Sect. 302        1     12K 

10-K/A   —   Amendment to Annual Report
Document Table of Contents

           UNITED STATES
            SECURITIES AND EXCHANGE COMMISSION
            WASHINGTON, D.C. 20549

               FORM 10-K/A
               Amendment No. 1

The Issuing Entity is filing this Form 10-K/A to replace Exhibits 31, 33(a)     
and 34(a) to the original Form 10-K filed on March 29, 2007. American Security  
Insurance Company, Standard Guaranty Insurance Company and TrackSure Insurance  
Agency, Inc. (formerly, "Safeco Financial Institution Solutions, Inc.")         
("Assurant Inc.") recently provided the Issuing Entity with a revised report on 
assessment of compliance with servicing criteria for asset-backed securities    
and a related attestation. In the original assessment previously provided to    
the Issuing Entity, Assurant Inc. excluded Item 1122(d)(4)(xii) from the scope  
of its assessment. Assurant Inc. recently provided the Issuing Entity with a    
revised assessment of compliance that assesses Assurant Inc.'s compliance with  
Item 1122(d)(4)(xii) and identifies material instance of non compliance with    
this criterion. This material instance of non compliance is noted in this Form  
10-K/A under "Additional Disclosure Items For Regulation AB." The Issuing       
Entity has included this revised assessment of compliance under Exhibit 33(a),  
the related attestation under Exhibit 34(a) and a revised Rule                  
13a-14(d)/15d-14(d) Certification under Exhibit 31. This Form 10-K/A does not   
otherwise amend the original Form 10-K filed with the Commission on             
March 29, 2007.                                                                 

(Mark one)                                                                  

/X/ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES         
EXCHANGE ACT OF 1934                                                
For the fiscal year ended December 31, 2006                         

OR                                                                  

/ / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES     
EXCHANGE ACT OF 1934                                                

Commission file number:  333-135481-10                            

Thornburg Mortgage Securities Trust 2006-6                        
(exact name of issuing entity as specified in its charter)        

Credit Suisse First Boston Mortgage Securities Corp.              
(exact name of the depositor as specified in its charter)         

Thornburg Mortgage Home Loans, Inc.                               
(exact name of the sponsor as specified in its charter)           

Delaware                                          51-0611777                
(State or other jurisdiction of                   51-0611778                
incorporation or organization)                    (I.R.S. Employer          
                                           Identification No.)

c/o Wells Fargo Bank, N.A.                                                
9062 Old Annapolis Road                                                   
Columbia, MD                                21045                         
(Address of principal executive offices)    (Zip Code)                      

Registrant's telephone number, including area code: (410) 884-2000          

Securities registered pursuant to Section 12(b) of the Act:                 

NONE.                                                           

Securities registered pursuant to Section 12(g) of the Act:                 

NONE.                                                           

Indicate by check mark if the registrant is a well-known seasoned issuer,   
as defined in Rule 405 of the Securities Act.                               

Yes  ___     No  X                                              

Indicate by check mark if the registrant is not required to file reports    
pursuant to Section 13 or Section 15(d) of the Act.                         

Yes  ___     No  X                                              

Indicate by check mark whether the registrant (1) has filed all reports     
required to be filed by Section 13 or 15(d) of the Securities Exchange      
Act of 1934 during the preceding 12 months (or for such shorter period      
that the registrant was required to file such reports), and (2) has been    
subject to such filing requirements for the past 90 days.                   

Yes  X       No  ___                                            

Indicate by check mark if disclosure of delinquent filers pursuant to       
Item 405 of Regulation S-K ( 229.405 of this chapter) is not contained      
herein, and will not be contained, to the best of registrant's knowledge,   
in definitive proxy or information statements incorporated by reference     
in Part III of this Form 10-K or any amendment to this Form 10-K.           

Not applicable.                                                 

Indicate by check mark whether the registrant is a large accelerated filer, 
an accelerated filer, or a non-accelerated filer. See definition of         
"accelerated filer and large accelerated filer" in Rule 12b-2 of the        
Exchange Act. (Check one):                                                  

Large accelerated filer ___  Accelerated filer ___  Non-accelerated filer X 

Indicate by check mark whether the registrant is a shell company (as        
defined in Rule 12b-2 of the Act).                                          

Yes  ___     No  X                                              

State the aggregate market value of the voting and non-voting common        
equity held by non-affiliates computed by reference to the price at which   
the common equity was last sold, or the average bid and asked price of      
such common equity, as of the last business day of the registrant's most    
recently completed second fiscal quarter.                                   

Not applicable.                                                 

Documents Incorporated by Reference                                   

List hereunder the following documents if incorporated by reference and     
the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the      
document is incorporated: (1)Any annual report to security holders; (2)     
Any proxy or information statement; and (3)Any prospectus filed pursuant    
to Rule 424(b) or (c) under the Securities Act of 1933. The listed          
documents should be clearly described for identification purposes (e.g.,    
annual report to security holders for fiscal year ended December 24, 1980). 

Not applicable.                                                 

PART I    
Item 1.  Business.                                                          

Omitted.                                                

Item 1A.  Risk Factors.                                                     

Omitted.                                                

Item 1B.  Unresolved Staff Comments.                                        

None.                                                   

Item 2.  Properties.                                                        

Omitted.                                                

Item 3.  Legal Proceedings.                                                 

Omitted.                                                

Item 4.  Submission of Matters to a Vote of Security Holders.               

Omitted.                                                

PART II         

Item 5. Market for Registrants Common Equity, Related Stockholder           
Matters and Issuer Purchases of Equity Securities.          

Omitted.                                                

Item 6.  Selected Financial Data.                                           

Omitted.                                                

Item 7.  Management's Discussion and Analysis of Financial Condition and    
Results of Operations.                                    

Omitted.                                                

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.        

Omitted.                                                

Item 8.  Financial Statements and Supplementary Data.                       

Omitted.                                                

Item 9.  Changes in and Disagreements With Accountants on Accounting and    
Financial Disclosure.                                     

Omitted.                                                

Item 9A. Controls and Procedures.                                           

Omitted.                                                

Item 9A(T). Controls and Procedures.                                        

Omitted.                                                

Item 9B. Other Information.                                                 

None.                                                   

PART III        

Item 10. Directors, Executive Officers and Corporate Governance.            

Omitted.                                                

Item 11. Executive Compensation.                                            

Omitted.                                                

Item 12. Security Ownership of Certain Beneficial Owners and                
Management and Related Stockholder Matters.               

Omitted.                                                

Item 13. Certain Relationships and Related Transactions, and Director       
Independence.                                             

Omitted.                                                

Item 14. Principal Accounting Fees and Services.                            

Omitted.                                                

ADDITIONAL DISCLOSURE ITEMS FOR REGULATION AB   

Item 1112(b) of Regulation AB, Significant Obligor Financial Information.   

          No single obligor represents more than 10% of the pool assets held
by this transaction.                                    

Item 1114(b)(2) and 1115(b) of Regulation AB, Significant Enhancement       
Provider Financial Information.                       

       No entity or group of affiliated entities provides any external
            credit enhancement, uses any derivative instruments or other support
for the certificates within this transaction.           

Item 1117 of Regulation AB, Legal Proceedings.                              

     The registrant knows of no material pending legal proceedings
          involving the entities contemplated by Item 1117 of Regulation AB,
       other than routine litigation incidental to the duties of those
respective parties.                                     

Item 1119 of Regulation AB, Affiliations and Certain Relationships and      
Related Transactions.                                 

None.                                                   

Item 1122 of Regulation AB, Compliance with Applicable Servicing Criteria.  

           The servicing criteria have been completed within the manner stated
         in the governing documents and are attached hereto under Item 15.

   Assurant, Inc. previously excluded the applicable servicing
         criteria set forth in Item 1122 (d)(4)(xii) from the scope of its
     assessment of compliance. Assurant, Inc. has now assessed its
           compliance with the Applicable Servicing Criteria for the Reporting
   Period of January 1, 2006 through December 31, 2006 and has
           identified a material instance of noncompliance with that servicing
        criterion. Specifically, Assurant, Inc. did not have, during the
           Reporting Period, sufficient policies and procedures to capture the
          information with respect to the Platform Transactions necessary to
    determine compliance with Item 1122(d)(4)(xii). Accordingly,
   Assurant, Inc. has restated its previous assessment for the
     Reporting Period, which excluded evaluation of the criterion,
          to include the criterion and reflect the material noncompliance as
a result of its assessment.                             

      The 1122 statements for Wells Fargo Bank, National Association
            (Corporate Trust Services) has disclosed material noncompliance with
        criterion 1122(d)(3)(i), as applicable to the Company during the
           twelve months ended December 31, 2006.  Certain monthly investor or
        remittance reports included errors in the calculation and/or the
reporting of delinquencies for the pool assets.         

   Although each servicing criterion required by Item 1122(d) of
  Regulation AB is addressed in one or more of the Assessments
   of Compliance with Servicing Criteria and related Attestation
    Reports included with this report, the Servicers', Cenlar FSB,
  Countrywide Home Loans Servicing LP and First Republic Bank,
  Assessment of Compliance and related Attestation Reports did
   not address each of the servicing criteria that the Servicers
were required to address under the terms of the related   
Servicing Agreements.  The Servicers have not identified  
such failure to provide an Assessment and Attestation for 
  these items as a material failure to fulfill its obligations
under the related servicing agreement in the Servicer's   
   Compliance Statements  provided under Item 1123 of Regulation
AB, because the Servicers assert that those items are not 
applicable to the Servicers.                              

Item 1123 of Regulation AB, Servicer Compliance Statement.                  

         The servicer compliance statements have been completed within the
        manner stated in the governing documents and are attached hereto
under Item 15.                                          

PART IV         

Item 15. Exhibits, Financial Statement Schedules.                           

(a) Exhibits                                                              

(4)  Pooling and Servicing Agreement is dated as of November 1, 2006  
         (the "Agreement"), among CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES
CORP., a Delaware corporation, as depositor (the "Depositor"),
        THORNBURG MORTGAGE HOME LOANS, INC., a Delaware corporation, as seller
         (the "Seller"), WELLS FARGO BANK, N.A., a national banking association,
     as master servicer (in such capacity, the "Master Servicer") and as
securities administrator (in such capacity, the "Securities   
Administrator"), WILMINGTON TRUST COMPANY, a Delaware banking 
       corporation, as Delaware trustee (the "Delaware Trustee") and LASALLE
       BANK NATIONAL ASSOCIATION, a national banking association, as trustee
    (in such capacity, the "Trustee") and custodian (in such capacity,
       the "Custodian").  (incorporated herein by reference from Exhibit 4.1
    of the Current  Report on Form 8-K of the Issuing Entity, as filed
with the Commission on December 14, 2006).                    

(10) Incorporated by reference as Exhibit (4).                        

(31) Rule 13a-14(d)/15d-14(d) Certifications.                           

(33) Reports on assessment of compliance with servicing criteria for    
asset-backed securities.                                      

                                                              [Enlarge/Download Table]
                                                                                             

                                                                                             
a) Assurant Inc. as Sub-Contractor for Cenlar, FSB <F1>                                      
b) Cenlar, FSB, as Sub-Servicer for Thornburg Mortgage <F1>                                  
c) Countrywide Home Loans Servicing LP, as Servicer <F1>                                     
d) First American Real Estate Solutions of Texas, L.P. as Sub-Contractor for Cenlar, FSB <F1>
e) First Republic Bank, as Servicer <F1>                                                     
f) LaSalle Bank, National Association, as Custodian <F1>                                     
g) Wells Fargo Bank, N.A., as Master Servicer <F1>                                           
h) Wells Fargo Bank, N.A., as Securities Administrator <F1>                                  

                                                                          
(34) Attestation reports on assessment of compliance with servicing   
criteria for asset-backed securities.                       

                                                              [Enlarge/Download Table]
                                                                                             

                                                                                             
a) Assurant Inc. as Sub-Contractor for Cenlar, FSB <F1>                                      
b) Cenlar, FSB, as Sub-Servicer for Thornburg Mortgage <F1>                                  
c) Countrywide Home Loans Servicing LP, as Servicer <F1>                                     
d) First American Real Estate Solutions of Texas, L.P. as Sub-Contractor for Cenlar, FSB <F1>
e) First Republic Bank, as Servicer <F1>                                                     
f) LaSalle Bank, National Association, as Custodian <F1>                                     
g) Wells Fargo Bank, N.A., as Master Servicer <F1>                                           
h) Wells Fargo Bank, N.A., as Securities Administrator <F1>                                  

                                                                          
(35) Servicer compliance statement.                                   

                                                                      [Download Table]
                                                           

                                                           
a) Cenlar, FSB, as Sub-Servicer for Thornburg Mortgage <F1>
b) First Republic Bank, as Servicer <F1>                   
c) Wells Fargo Bank, N.A., as Master Servicer <F1>         
d) Wells Fargo Bank, N.A., as Securities Administrator <F1>

                                                                          
(b) Not applicable.                                                       

(c) Omitted.                                                              

<F1> Filed herewith.                                                        

SIGNATURES      

Pursuant to the requirements of Section 13 or 15(d) of the Securities       
Exchange Act of 1934, the registrant has duly caused this report to be      
signed on its behalf by the undersigned, thereunto duly authorized.         

Thornburg Mortgage Securities Trust 2006-6                              
(Issuing Entity)                                                        

Wells Fargo Bank, N.A.                                                  
(Master Servicer)                                                       

/s/ Kristen Ann Cronin                                                  
Kristen Ann Cronin, Vice President                                      
   (senior officer in charge of the servicing function of the master servicer)

Date: May 27, 2008                                                      

Exhibit Index                                                               

Exhibit No.                                                                 

(4) Pooling and Servicing Agreement is dated as of November 1, 2006   
         (the "Agreement"), among CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES
CORP., a Delaware corporation, as depositor (the "Depositor"),
        THORNBURG MORTGAGE HOME LOANS, INC., a Delaware corporation, as seller
         (the "Seller"), WELLS FARGO BANK, N.A., a national banking association,
     as master servicer (in such capacity, the "Master Servicer") and as
securities administrator (in such capacity, the "Securities   
Administrator"), WILMINGTON TRUST COMPANY, a Delaware banking 
       corporation, as Delaware trustee (the "Delaware Trustee") and LASALLE
       BANK NATIONAL ASSOCIATION, a national banking association, as trustee
    (in such capacity, the "Trustee") and custodian (in such capacity,
       the "Custodian").  (incorporated herein by reference from Exhibit 4.1
    of the Current  Report on Form 8-K of the Issuing Entity, as filed
with the Commission on December 14, 2006).                    

(10) Incorporated by reference as Exhibit (4).                        

(31) Rule 13a-14(d)/15d-14(d) Certifications.                           

(33) Reports on assessment of compliance with servicing criteria for    
asset-backed securities.                                      

                                                              [Enlarge/Download Table]
                                                                                        

                                                                                        
a) Assurant Inc. as Sub-Contractor for Cenlar, FSB                                      
b) Cenlar, FSB, as Sub-Servicer for Thornburg Mortgage                                  
c) Countrywide Home Loans Servicing LP, as Servicer                                     
d) First American Real Estate Solutions of Texas, L.P. as Sub-Contractor for Cenlar, FSB
e) First Republic Bank, as Servicer                                                     
f) LaSalle Bank, National Association, as Custodian                                     
g) Wells Fargo Bank, N.A., as Master Servicer                                           
h) Wells Fargo Bank, N.A., as Securities Administrator                                  

                                                                          
(34) Attestation reports on assessment of compliance with servicing   
criteria for asset-backed securities.                       

                                                              [Enlarge/Download Table]
                                                                                        

                                                                                        
a) Assurant Inc. as Sub-Contractor for Cenlar, FSB                                      
b) Cenlar, FSB, as Sub-Servicer for Thornburg Mortgage                                  
c) Countrywide Home Loans Servicing LP, as Servicer                                     
d) First American Real Estate Solutions of Texas, L.P. as Sub-Contractor for Cenlar, FSB
e) First Republic Bank, as Servicer                                                     
f) LaSalle Bank, National Association, as Custodian                                     
g) Wells Fargo Bank, N.A., as Master Servicer                                           
h) Wells Fargo Bank, N.A., as Securities Administrator                                  

                                                                          
(35) Servicer compliance statement.                                   

                                                                      [Download Table]
                                                      

                                                      
a) Cenlar, FSB, as Sub-Servicer for Thornburg Mortgage
b) First Republic Bank, as Servicer                   
c) Wells Fargo Bank, N.A., as Master Servicer         
d) Wells Fargo Bank, N.A., as Securities Administrator

                                                                          

Dates Referenced Herein   and   Documents Incorporated by Reference

This ‘10-K/A’ Filing		Date		Other Filings
Filed on:		5/27/08
		3/29/07		10-K
For Period End:		12/31/06		10-K
		12/14/06		8-K
		11/1/06
		1/1/06
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