As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
***CORROSION*** AFT CARGO BAY L/H Z-CHANNEL HAS CORROSION FROM STA 747+10' -847 LBL 21 WL 154 / DUE TO CORROSION ON AFT CARGO L/H Z-CHANNEL STA 747+ 10-847; REMOVED AND REPLACED IAW SRM 53-00-53-1A-2; FIG. 103; DETAIL D AND BOEING DWG 146A7500.