As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE OUT OF SERVICE IN HEAVY CHECK, MAINTENANCE FOUND AFT CABIN FLOORBEAM SUPPORT BRACKET CORRODED AT FR87 RBL 29. MAINTENANCE REMOVED AND REPLACED AFT CABIN FLOORBEAM SUPPORT BRACKET AT FR87 IAW SRM 51-40-08 PAGES 1-4. THIS AIRCRAFT REMAINS OUT OF SERVICE FOR DURATION OF THE HEAVY CHECK COMPLETION.