What was found
MAIN CABIN L/H FLOOR MOP SILL /CREASE WEB ANGLE HAS AREAS CORROSION ON UPPER SURFACE BETWEEN BS 795 AND BS 880. REMOVED CORROSION AT MAIN CABIN L/H CREASE WEB ANGLE "MOP SILL" ON UPPER SURFACE BETWEEN BS 795 - 880 IAW B 757 SRM 51-10-02-OG,EVALUATED AREA ORIGINAL MAT .070",MAT LOSS MORE THAN 50% FOUND TO BE OUT OF LIMITS IAW B 757 SRM 53-30-13-01 FIG 1 DETAIL III AND 53-30-13-1A FIG 101 DETAIL III.REMOVED,FABRICATED AND INSTALLED NEW CREASE WEB ANGLE,MOP SILL IAW B 757 SRM 51-40-02-OG AND BOEING DWG # 143N5520 REV: BM & E. FROM STA 750 TO 900.