Merrill Lynch Puttable FLOATs/RITES Trust puttable floating option tax-exempt receipts series PT-4004, relating to Pennsylvania Housing Finance Agency single-family mortgage revenue bonds, are rated 'AA+/A-1+'. The long-term component of the rating is based on the underlying bond. The short-term component of the rating is based on a liquidity facility from Merrill Lynch Capital Services (NR) and a liquidity guarantee from Merrill Lynch&Co. Inc. (A-1+). The expiration date of the liquidity facility is March 15, 2008. Merrill Lynch Puttable FLOATs/RITES Trust residual interest tax-exempt receipts series PT-4004, relating to Pennsylvania Housing Finance Agency single-family mortgage revenue bonds, are rated 'AA+'. The long-term rating is based on the underlying bond.