What was found
GYR - DURING C20 CHECK DISCOVERED,THE RT AFT FLAP, RT WING, ON THE INBOARD END DELAMINATED. MAINTENANCE REMOVED DAMAGED SKIN AND CORE ON THE RT AFT FLAP IAW BOEING 737-300 SRM 51-70-10-2R. FABRICATED DOUBLER AND FILLER IAW BOEING 737-300 SRM 51-70-10-2R. BONDED AND SEALED REPAIR PARTS TO THE RT AFT FLAP, RT WING, ON THE INBOARD END IAW BOEING 737-300 SRM 51-70-10-2R.