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 AT STA 947 CORRODED. GROUNDED - YES. BLENDED CORROSION INTERCOSTAL HAS 100% MATERIAL LOSS FOUND OUT OF LIMITS ALLOWABLE DAMAGE IAW B737-800 STM 53-70-51-1A-1 AT STA 242.5 LBL 24.5, DRILLED FIT NEW INTERCOSTAL IAW B737-800 SRM 51-40-05 AND BAC DWG 147A5650 REV. C, INTERCOSTAL ON N/R 42897 CUST. CARD NO G1995897.