What was found
MAIN CABIN STA 680-700 LT SIDE AT DOOR 2L STRUCTURE INTERCOSTAL HAS CORROSION. (OUT OF LIMITS) REMOVED CORROSION FROM MCD, BS 680-700, LHS, AT L2 DOOR STRUCTURE IAW SRM 51-10-02. CHECKED LIMITS AND FOUND TO BE OUT OF LIMITS IAW SRM 53-30-15. ORIGINAL MATERIAL THICKNESS .063" / AFTER REWORK- .049". REMOVED INTERCOSTAL AND SUPPORT IAW SRM 51-40-02. RECEIVED NEW PARTS, PN 143N5522-3 AND 143N5410-1 ON MAE PO3 MAG0094730. LOCATED AND DRILLED INTERCOSTAL ANGLE IAW SRM 51-40-05. INSTALLED NUTPLATES IAW SRM 51-40-02. INSTALLED INTERCOSTAL AND ANGLE 2 MCD BS 680-700, LHS, AT L2 DOOR, IAW SRM 51-40-02. THIS REPAIR IS CLASSIFIED AS A CAT "A" MAJOR REPAIR.