As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOOR SUPPORT BETWEEN BS 312 & 328 CRACKED ON THE UPPER ATTACH FLANGE AT APPROX RBL31. RECEIVED A NEW INTERCOSTAL IAW AIPC 53-42-00-59D. LOCATED AND DRILLED FLOOR SUPPORT IAW SRM 51-40-05. INSTALLED THE FLOOR SUPPORT BS 312 - 328 IAW DWG 141A5400, & SRM 51-40-02.