As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO PIT BILGE INTERCOSTAL STA 807-827 RBL 6 WL 155 HAS CORROSION ON INBOARD AND OUTBOARD SIDES EMITTING FROM KEEL CHORD STR 27R / EVALUATED CORROSION DAMAGE ON AFT CARGO BILGE INTERCOSTAL STA 807 - 827 RBL 6 FOUND OUT OF LIMITS W/ 100% MATERIAL LOSS IAW B737 SRM 53-00-04-1A-1. REMOVED & REPLACED INTERCOSTAL W/ NEW FABRICATED INTERCOSTAL P/N 146A8132-18 IAW BOEING DWG 146A8132 REV B & A & 146A8130 REV B.