As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK, FOUND SERVICE DOOR SURROUND STRUCTURE AT FRAME 22 BEHIND LOWER AFT DOOR GUIDE FRAME CORRODED. THE ACFT WAS REMOVED FROM SERVICE. REPAIRED FRAME IAW SRM 53-00-04 AND 51-40-02. LEVEL OF CORROSION NOT SPECIFIED. THE ACFT WAS RETURNED TO SERVICE.