What was found
WHILE IN FOR D-CHECK, MAINTENANCE FOUND RT OUTBD LEADING EDGE LOWER SKIN ABOVE NR 4 PYLON IS CRACKED AT PYLON CUTOUT, APPROX 3.4 INCHES LONG. STOP DRILLED CRACK, FABRICATED AND INSTALLED DOUBLER REPAIR IAW SRM 57-2-1A AND SRM 51-1-20D.