As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN UNDER FLOOR STA 540 PANEL SUPPORT CRACKED AT RBL 0 - RBL 10. GROUNDED - YES. REMOVED PANEL SUPPORT IAW B737-800 SRM 51-40-02. NEW PLATE PART . DRILLED TO FIT IAW B737-800 SRM 51-40-05. INSTALLED PANEL SUPPORT IAW B737-800 SRM 51-40-02 REF AIPC. 53-42-11.