What was found
YVR - MAJOR REPAIR - DURING C-20 CHECK CRACKS WERE FOUND ON THE LT AILERON LEADING EDGE RIBS AT THE OUTBOARD END, AND INBOARD OF THE NR 2 HINGE FITTING. MAINTENANCE REMOVED OUTBOARD RIB OF LT AILERON, FABRICATED A NEW RIB, AND INSTALLED REPAIR PER DWG 65-46456. MAINTENANCE DRESSED OUT CRACKS AT INBOARD OF THE NR 2 HINGE FITTING IAW B737-200 SRM 57-50-1 FIG 4, PG 6 H. PERFORMED HFEC INSPECTION TO VERIFY CRACKS WERE CONTAINED, NO CRACKS NOTED.