As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOOR SUPPORT STRUCTURE IS CRACKED AT STA 540 APPROX RBL 1. GROUNDED - YES. REMOVED CRACKED FLOOR SUPPORT / BREAK PNL ASSY IAW B737-800 SRM 51-40-02. DRILLED TO FIT NEW FLOOR SUPPORT/ BREAK PNL ASSY IAW B737-800 SRM 51-40-05 AND BAC DWG 143A0060 REV A.INSTALLED NEW FLOOR SUPPORT / BREAK PNL ASSY IAW B737-800 SRM 51-40-02 AND BAC DWG 143A0060 REV A.