As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOOR SUPPORT INTERCOSTAL CORRODED AT STA 986.5 L/H. GROUNDED - YES. REMOVED CORROSION IAW B737-800 SRM 51-10-02. NO ALLOWABLE DAMAGE STATED DRILLED TO FIT NEW INTERCOSTAL 147A5705Y1 PO:1137794.2 B737-800 SRM 51-40-05 AND BOEING DWG 147A5700 REV. B INTERCOSTAL INSTALLED ON N/R 41483 CUSTOMER CARD G2250993.