As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON INSIDE CABIN R2 DOOR SILL AT FR 66 STR 23R. REMOVED CORROSION VERIFIED BEYOND 25% ALLOWABLE LOSS LIMITS IAW SRM 53-41-14-283-002 REMOVED AND REPLACED AFT RT SILL AT FRAME 66 IAW SRM 51-42-11.