What was found
AIRCRAFT IN BASE MAINTENANCE: R/H O/B AFT FLAP HAS LARGE AREA OF DELAMINATION ON THE I/B UPPERSURFACE. REMOVED AND REINSTALLED R/H O/B AFT FLAP IAW B737-NG-AMM 27-51-22 REMOVED DAMAGED SKIN (9.25"X12") ON R/H O/B AFT FLAP IB UPPERSURFACE IAW B737-NG SRM 57-53-01-2R-4, B737-NG SRM51-70-10-2R-4, AND B737-NG SRM 51-70-10-2R FABRICATED REPAIR FILLER (9.25"X12") AND REPAIR DOUBLER (3"X12") USING 7075-T6 BARE .016" PO# FS80792 IAW B737-NG SRM 57-53-01-2R-4, B737-NG SRM 51-70-10-2R-4, AND B737-NG SRM 51-70-10-2R CLEANED AND PREPPED MATING SURFACES ON REPAIR FILLER/DOUBLER IAW B737-NG SRM 57-53-01-2R-4, B737-NG SRM 51--70-10-2R-4, AND B737-NG SRM 51-70-10-2R