As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE: REF STS WO# W003745 NR N0493 MAIN CABIN R4 DOOR CUT OUT LOWER SIDE SILL SHAPE CORRODED AROUND FASTENERS; REF STS W003745 N0493 REMOVED AND REPLACED SILL SHAPE AT R4 DOOR SILL LOWER CUTOUT IAW SRM 51-72-11-911-001. (CONSIDERED A MAJOR REPAIR)