What was found
MCN - MAJOR REPAIR - "C" - DURING C-20 CHECK A GOUGE .009 TO .027 DEEP X 7" LONG WAS FOUND ON THE #1 ENGINE AFT PYLON INBOARD SIDE SKIN JUST FORWARD OF THE FLIPPER DOOR. MAINTENANCE REMOVED THE CLOSEOUT DOUBLER BELOW MIDFLAP OUTBOARD ATTACH POINT ON INBOARD SIDE OF PYLON; TRIMMED OUT DAMAGED SKIN AND PERFORMED HFEC INSPECTION TO VERIFY NO CRACKS; FABRICATED REPAIR SKIN AND SPLICE DOUBLER AND INSTALLED REPAIRS IAW AWA ER 15-5400-02036-TB2.