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 AFT CABIN FLOORBEAM - Y 81 AT FR 17 + 10". REMOVED CORROSION VERIFIED BEYOND .024" LOSS LIMITS IAW SRM 53-11-14-283-004. REMOVED & REPLACED BEAM -Y81 AT FR 17 + 10" ON NR 440500-30481.