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 REF NR 20453 MAIN CABIN FWD WET AREA FLOOR STRUCTURE -Y81 FR 16 STR 23R; REF NR 20453 REMOVED CORROSION ON FLOOR STRUCTURE -Y81 FR 16 STR 23R VERIFIED BEYOND ALLOWABLE LIMITS IAW SRM 53-11-14-283-007 REMOVED AND REPLACED IAW SRM 51-72-11 DRW D53114118.