What was found
DURING M- CHECK FOUND MAIN CABIN STA.712 LBL 56 FLOOR BEAM WEB MISSED DRILLED & PILOT HOLES NOT USED FOUND AFTER REMOVAL OF FRAME. REMOVED DAMAGED FLOORBEAM WEB AT STA 712 LT SIDE LBL 56 FABRICATED NEW FLOORBEAM WEB 7075T6 .063 IAW DC9 DWG 19923411. TREATED, PRIMED, & INSTALLED NEW FLOORBEAM WEB IAW DC9 SRM 51-10-3, 51-30-2, & 51-30-5.