As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN FOR HEAVY CHECK FOUND PAX CABIN AFT WET AREA FLOOR STRUCTURE BTW FR86-85 RBL 11 UPPER SHEET PN 170-86101-001 FOUND CORRODED. AAR MX REMOVED AND REPLACED UPPER SHEET IAW SRM 51-41-01, 51-43-03 SEE NRC# 4000170-1000-0104 FOR WORK PERFORMED. AC REMAINS IN YRQ FOR COMPLETION.