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 STA 967 - STA 986 RBL 16 CORRODED. GROUNDED - YES. CORROSION IS AROUND NUTPLATE HOLE. OUT OF ALLOWABLE LIMITS IAW B737-800 SRM 53-70-51-1A-1. DRILLED TO FIT NEW INTERCOSTAL IAW B737-800 SRM 51-40-05 AND BAC DWG 140A9870 REV- INTERCOSTAL INSTALLED ON N/R 29593 CUSTOMER CARD G1954093.