What was found
MCN - MAJOR REPAIR - DURING C-17 CHECK HEAVY EXFOLIATION CORROSION WAS FOUND ON CREASE BEAM (INNER CHORD) AT L2 DOOR FROM LT AFT LAVATORY TO DOORWAY DRAIN BS 967 - BS 986.5, LBL 66. MAINTENANCE REMOVED DAMAGED CREASE BEAM, LT AFT DRAIN PAN, 2 EACH STIFFENERS, AND 1 ATTACH ANGLE AT BS 967 - BS 986.5, LBL 66. FABRICATED AND INSTALLED A NEW CREASE BEAM, REINSTALLED LT AFT DRAIN PAN, 2 EACH STIFFENERS, AND 1 ATTACH ANGLE IAW B737-300 SRM 51-40-02 PG 3-4, 11 & 38.