What was found
WHILE IN FOR C-CHECK, MAINTENANCE REPORTED MAIN CARGO DOOR HAS TOOLING MARKS/GOUGES IN Z-FRAME STA 590 WL 302. GOUGE OUT OF LIMITS, FABRICATED REPAIR ANGLE AND HEAT TREATED. INSTALLED PART IAW SRM 51-40-3, 51-10-2, 51-30-2, AND 53-10-1.