What was found
CTR FUEL TANK UPPER SURFACE HAS CORROSION UNDER STUB BEAM ATTACHMENTS AT STA940, RBL64. ACCOMPLISHED WING-CTR-UPPER SKIN PLANK CORROSION REPAIR, WS 18, RBL 65, IAW EA F-5710-146245, STEPS 1-10. REF FAA FORM 8100-9, DATED 03/11/2011. CAT. "A" MAJOR REPAIR.