What was found
CORROSION ON MAIN FLOOR STRUCTURE BOX BEAM, BS 1640 TO 1660, LBL 55 CP53-251-01I. REMOVED CORROSION ON MAIN CABIN FLOOR STRUCTURE BOX BEAM BET BS 1640-STA 1660 LBL 55- ORIG MATERIAL THICKNESS 0.071, MATERIAL LOSS OF 0.018 , FOUND TO BE OUT OF LIMITS IAW SRM 53-00-51, FIG 101 DETAIL III. R & R MAIN CABIN FLOOR STRUCTURE BOX BEAM BS 1640-1660, LBL55 IAW SRM 51-40-05, 51-40-02, DWG NR 146N5230 & 146N8722, REV B, MAJOR REPAIR FIELD INCORRECTLY ENTERED AS N, THIS IS A MAJOR REPAIR, CORRECT TO Y.