What was found
DURING HEAVY CHECK, LOWER CENTER SECTION SEAL REST, AFT CARGO DOOR THRESHOLD IS CORRODED. MAINTENANCE R & R LOWER CENTER SECTION SEAL REST AFT CARGO DOOR THRESHOLD IAW SRM 51-40-02, 51-23-04, 51-23-06, 51-21-01. PN 170-85251-401, SEAL REST.