As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, DURING DVI OF CABIN FLOOR STRUCTURE BTW FR47-70 FOUND Y1192 FR 66-69 LH BEAM CORRODED. REPLACEMENT IS REQUIRED PER SRM 51-72-11 REV. 129; Y1192 FR 47-70 FOUND FR 68-69L REPLACED AS PER SRM 51-72-11 REV. 129. REF. LHT NR 5000917784-0010 FOR DETAILS. THIS IS CLASSIFIED AS A MAJOR REPAIR.