As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FORWARD CARGO BAY CORROSION ON INTERCOSTALS UNDER LEFT CARGO FLOOR Z CHANNEL STA 500B-500C LBL 25 WL 160 NEAR SCREW HOLES, MARKED. REMOVED FWD CARGO BAY INTERCOSTAL UNDER LEFT CARGO FLOOR 2 CHANNEL BS 500B-500C LBL 25. LOCATED AND DRILLED NEW INTERCOSTAL AND INSTALLED, IAW SRM 51-40-02-0G-0 SRM 51-40-05-0G-0 AND DWG 143A7505 81142U.