What was found
DURING M-CHECK FOUND MAIN CABIN FLOORBEAM CORRODED ON UPPER SURFACE OF REPAIR CHORD EXTENDING ONTO ORIGINAL CHORD ON BOTH ENDS, STA 345, RBL 36 TO LBL 18. REMOVED CORRODED EXISTING REPAIR FLOORBEAM STA 345 CUT OUT FLOORBEAM FROM LBL 53 TO RBL 36, FABRICATED REPLACEMENT CHORD, LOCATED & DRILLED, TREATED & PRIMED AND INSTALLED REPLACEMENT PARTS AT STA 345, LBL 53 TO RBL 36 IN REF TO SRM 53-00-51, REP 3, FIG 201, PG 201 TO 206 & B757-A-53-01-07 -801-663A-A.