As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 2479697) DURING INSPECTION FOUND AFT CARGO COMPARTMENT, INTERCOSTAL CORRODED AT STA.772 RBL20. REMOVED DAMAGED INTERCOSTAL FROM AFT CARGO COMPARTMENT LOCATED AT R/H STA 767-787 RBL 20 AND INSTALLED A NEW INTERCOSTAL PER B737 SRM 51-40-02-0G AND DWG# 146A0081 REV A.