As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN FLOORBEAM UPPER SURFACE HAS WEAR MARKS AROUND FASTENER HOLE AT BS 764 BETWEEN RBL 20 AND RBL 54. *S/D* SUSPECT TOOLING MARKS. REMOVED DAMAGE AREA, FABRICATED AND INSTALLED REPAIR IAW SRM 53-00-51 FIG 201 TABLE I. AC OK FOR SERVICE.