Three classes of mezzanine and subordinated tranches from two mortgage-backed securitizations issued by Credit Suisse First Boston Mortgage Securities Corp. have been placed under review for possible downgrade by Moody's Investors Service.The affected securities are class B of series 2002-HE1 and classes M-F-2 and B-F of series 2002-HE4. In addition, Moody's placed three tranches from three CSFB mortgage-backed deals under review for possible upgrade. The negative actions were based on the fact that the bonds' credit enhancement levels (including excess spread) are low compared with projected losses for the current rating level, the rating agency said. The pools are subprime first-lien adjustable-rate and fixed-rate loans.

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