As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN AFT WET AREA; INTERCOSTAL CORRODED ON UPPER SURFACE APPROX. BS 947 RBL-52.<[01] PERFORMED FPI ON PART IAW BAC 5423. NO CRACKS FOUND INSP ONLY;[02] FABRICATED AND INSTALLED INTERCOASTAL AT STA 947.5 AND RBL 52 PN 147A5660-30 IAW B737-800 SRM 51-40-02 AND BAC DWG 147A5650 REV-; AND 147A4660 REV-;[03] FABRICATED AND INSTALLED INTERCOASTAL AT STA 947.5 AND RBL 52 PN 147A5660-30 IAW B737-800 SRM 51-40-02 AND BAC DWG 147A5650 REV-; AND 147A4660 REV-