Two certificates from CS First Boston Mortgage Securities Corp. series 1997-1R have been placed under review for possible downgrade by Moody's Investors Service.The affected certificates are classes 1-B3 and 1-B4. In addition, classes 1-M1, 1-M2, and 1-M3 were placed under review for possible upgrade. The transaction is a resecuritization backed by other residential mortgage-backed securities. Moody's said the negative rating action was based on the weak performance of the underlying security and reduced credit enhancement relative to projected losses.

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