What was found
INSIDE CABIN STA 1640 LBL 58" FLOORBEAM HAS CORROSION AT FASTENER HOLE. REMOVED CORROSION IAW SRM 51-10-02, CHECKED LIMITS FOUND REMAINING MAT 0.095", OUT OF LIMITS IAW SRM 53-00-51, FIG 101, DET VI. REMOVED FLOORBEAM AT STA 1640 IAW SRM 51-40-02, RECEIVED NEW FLOORBEAM PN BAC 1518-338/18A, BATCH 1847767, TRIMED BOTH END AND DRILLED FASTENER HOLES IAW SRM 51-40-02, INSTALLED NEW FLOORBEAM AT STA 1640 BETWEEN LBL70 TO RBL 70 IAW SRM 53-60-51, PAGE 5, FIG 1 AND SRM 51-40-02. MAJOR REPAIR.