What was found
WHILE ACFT IN HEAVY CHECK MAINT FOUND AFT CARGO DOOR CUTOUT LOWER CENTER SEAL REST CORRODED. REMOVED AND REPLACED SEAL REST REF SRM 51-40-08, RESTORED SURFACE PROTECTION REF SRM 51-10-04, 51-10-05, AND 51-10-06. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.