As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN CENTER WING BOX FLOOR SUPPORT BREAK CRACKED AT FASTENER'S TAIL RBL 1 STA 540<[01] REMOVED AND REPLACED SUPPORT BREAK ASSY AT MAIN CABIN STA 540 BETWEEN BL 0 TO RBL 24 REF B737-700 SRM 51-40-02-0G-0 AND DWG# 143A0060.;[02] VERIFIED STEP 1 COMPLETE.