As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING M CHECK FOUND MAIN CABIN STA 712 LBL 56 FLOORBEAM WEB MISSED DRILLED & PILOT HOLES NOT USED FOUND AFTER REMOVAL OF FRAME REMOVED DAMAGED FLOORBEAM WEB AT STA 712 L/H SIDE LBL 56. FABRICATED NEW FLOORBEAM WEB 7075-T6 .063 IAW DC-9 DWG#19923411. TREATED, PRIMED & INSTALLED NEW FLOORBEAM WEB IAW DC-9 SRM 51-10-3, SRM 51-30-2 & SRM 51-30-5.