As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN; FLOOR STRUCTURE SUPPORT HAS CRACK AT STA 540; BL 0 TO RBL 24.75.<[01] REMOVED AND REPLACED MAIN CABIN FLOOR STRUCTURE WITH NEW SUPPORT AT STA 540; BL 0 TO RBL 24.75 IAW SRM 51-40-02 AND BOEING DWG 143A0060 REV:-; AMM 20-60-07-913-801;[02] VERIFIED CORRECTIVE ACTION