The rating on Merrill Lynch Puttable FLOATs/RITES Trust puttable floating option tax-exempt receipts series PA-1144, relating to Philadelphia, Pa. gas works revenue bonds third series (1998 general ordinance), has been affirmed following an amendment to the trust documents. The long-term component of the rating is based on the FSA-insured underlying bonds. The short-term component of the rating is based on Merrill Lynch&Co. Inc. The stable outlook is based on the outlook of the bond insurer.