As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: AFT CABIN WET AREA PASSENGER FLOOR STRUCTURE UPPER SURFACE AT STA 947.5 RBL 25 - FLOOR STRUCTURE AROUND RH AFT LAV AFT IB MOUNT HAS EVIDENCE OF CORROSION . REMOVED AND REPLACED INTERCOSTAL AT RBL 24 STA 947 TO STA 967 IAW B737-NG SRM 51-40-02