What was found
YVR - MAJOR REPAIR - "C" - DURING C-13 CHECK A CRACK WAS FOUND AT CUTOUT OF THE #1 ENGINE PYLON TOP FWD PANEL 5727L. MAINTENANCE PERFORMED HFEC INSPECTION AND VERIFIED THAT THE CRACK WAS CONTAINED BY THE FASTENER HOLE, THEN FABRICATED & INSTALLED A DOUBLER IAW DWG 311A1023, B737-300 SRM 51-10-02 PG.12, AND AWA ER 03-5433-00340-DL1.