As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK, THE PRESSURE FLOOR SKIN OB OF LBL 9, BETWEEN FS 449.85 AND FS 559+2, WAS FOUND TO BE CORRODED BEYOND LIMITS. UPON FURTHER INSPECTION OF THE PRESSURE FLOOR SKIN OB OF LBL 9, BETWEEN FS 449.85 AND FS 559+2, MAINTENANCE DETERMINED IT WAS NOT CORROSION. (K)