Two subordinated tranches from two mortgage-backed securitizations issued by Credit Suisse First Boston Mortgage Securities Corp. in 2001 and 2002 have been placed under review for possible downgrade by Moody's Investors Service.The affected securities are class B-3 of series 2001-2 and class VII-M-2 of series 2002-AR31. The actions were based on the fact that the bonds' credit enhancement levels "may be low" in view of projected losses for the current rating level, Fitch said.

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