As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO COMPARTMENT; UPPER FASTENER HOLES ON INTERCOSTAL CORRODED ON UPPER AND LOWER SURFACES; STA 747-767 RBL 27 WL 156. / EVALUATED LIMITS OF DAMAGE ON AFT CARGO BAY R/H INTERCOSTAL STA 747 - STA 767 RBL 27 WL 156. NO ALLOWABLE DAMAGE LIMITS FOUND IN 737-800 SRM INTERCOSTAL IS OUT OF LIMITS. REMOVED AND REPLACED INTERCOSTAL IAW SRM 51-40-02-0G-0 AND DWG: 146A752 REV: - . APPLIED CIC TO NEW INTERCOSTAL IAW AMM 51-21-91-620-802 MPN: 146A7505-8 ATAG: WN3186