As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO FLOOR STRUCTURE, RT INTERCOSTAL STA 727A-727B HAS CORROSION AT NUTPLATE HOLE. VIEW UNDER TRANSTIION PANEL. GROUNDED - YES. FOUND TO BE OUT OF LIMITS, REMOVED & REPLACED INTERCOSTAL IAW B737-800 SRM 51-40-02 W= 1.0" O= .032 R= .025 L= 1.0" D= .007.