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 FLOOR AT FR88, LBL 40" CREASE BEAM CORRODED REF NR 6243413, ALSO FOUND AFT CABIN FLOOR AR FR90 LBL 33" CREASE BEAM CORRODED REF NR 6243411 AND AFT CABIN FLOOR AT FR 89 LBL 36" CREASE BEAM CORRODED. ALL DISCREPANCIES WERE EVALUATED AND CORRECTIVE ACTION WAS REMOVED AND REPLACED CREASE BEAM IAW SRM 51-40-08 PAGES 1-4. THIS AIRCRAFT REMAINS OUT OF SERVICE FOR DURATION OF THE HEAVY CHECK COMPLETION.