As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:C3 HAT CHANNEL HEAVILY CORRODED IN MAIN CABIN SUBFLOOR AT L1 DOOR STA 30 LBL 50. REMOVED HAT CHANNEL AT STA 30 LBL 50 IAW SRM 51-01-21. FABRICATED AND INSTALLED REPLACEMENT HAT CHANNEL AT STA 30 LBL 50 IAW SRM DWG 3713239, AND SRM 51-01-20D.