What was found
CORROSION HIDDEN BETWEEN LOWER CHORD & SKIN AT PP STATION 144 - 150, LT INNER SKIN ON NR 1 PYLON. REMOVED CORROSION FROM INNER WALL OF AFT SKIN AT PP STA 144 - PP STA 150 IAW SRM 51-10-02. AFTER REWORK AREA FOUND TO BE OUT OF LIMITS IAW SRM 54-50-01 FIG 101 DETAIL V ORIGINAL MATERIAL .090 MATERIAL LOSS .019 REMAINING MATERIAL .071 INSTALLED REPAIR DOUBLER IAW EA F-5450-7-T0308211 AND SB 757-54-0022 NACELLES / PYLON - PYLONS STRUCTURES NR 1 STRUT LT AFT SKIN PANEL CORROSION. CATEGORY "A" MAJOR REPAIR.