As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOOR SUPPORT IS CORRODED ON UPPER SURFACE OF UPPER FLANGE AT APPROX STA 921 LBL50 AT LAV MOUNT FITTING. REMOVED AND REPLACED MAIN CABIN FLOOR SUPPORT INTERCOSTAL AT APPROX STA 921 LBL50 AT LAV MOUNT FITTING INTERCOSTAL IAW B737- 800 SRM 51-40-02 AND BOEING DWG 147A5680 REV A.