What was found
NUMBER ONE STRUT/PYLON, LT SIDE SKIN, AT APPROXIMATE NAC STA 144, INTERNAL, IS CORRODED ON SKIN AND UNDER LOWER FRAME/CHORD. REMOVED CORROSION IAW SRM 54-50-01. ORIGINAL MATERIAL THICKNESS WAS .090", AFTER REWORK REMAINING MATERIAL THICKNESS WAS .079", OUT OF LIMITS IAW SRM 54-50-01. REPLACED NUMBER ONE STRUT/PYLON LT SIDE SKIN ASSY, P/N 311N5046-51, IAW SRM 51-40-02 AND DRAWING 311N5002, SHEET 13, REV E.