What was found
MAIN CABIN AFT CHECK PLATE BS 1715, RB 49 FLOOR SUPPORT STIFFENER CORRODED. REMOVED CORRODED STIFFENER FROM AFT DECK PLATE, BS 1715, RBL 49. FABRICATED NEW FROM 70750.071 PO ST-00006180, DIM 10.85" X 2" HEAT TREATED TO 7075T6, AND INSTALLED IAW SRM 51-40-02 AMM 51-21-15, FAS 0115, REV .012 + DWG 146N5300, REV E , ED.