What was found
LT AFT FUSELAGE UNDER REMOVED CENTER ENG SUPPORT EXT SKIN PANEL, TRIANGULAR RIB WEB IS CRACKED AT UPP IB CORNER ATTACHED TO OB SIDE OF VERT STAB SKIN BS 1360. (MKD) REMOVED RIB ASSEMBLY, DISASSEMBLED, FABRICATED AND HEAT TREATED NEW WEB, DRILLED UP NEW WEB, ASSEMBLED RIB ASSEMBLY AND INSTALLED REF BAC DRAWING 65-17555 AND SRM 51-30-02.