As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY MAINTENANCE PERFORMING INSPECTIONS IT WAS NOTED THAT THE LOWER FORWARD CORNER OF MAIN CARGO DOOR INNER SKIN IS GOUGED AND CRACKED. REMOVED INNER SKIN , FABRICATED NEW SKIN. INSTALLED SKIN, NO OTHER DEFECTS WERE NOTED AIRCRAFT WAS RETURNED TO SERVICE.