What was found
(CAN) ON GEAR RETRACTION CREW REPORTED A BANG FROM NOSE AREA AND THEN THE ISO VALVE LIGHT CAME ON, #2 HYDRAULIC QUANTITY WENT DOWN, MAIN GEAR WENT UP NOSE DID NOT. CREW SELECTED GEAR DOWN NOSE WENT GREEN IMMEDIATELY AND MAINS CAME DOWN, AS PER QRH ALTERNATE EXTENSION COMPLETED. #2 HYDRAULIC SYSTEM HAD 1 QT. REMAINING. MAINTENANCE FOUND NOSE LANDING GEAR DRAG STRUT ACTUATOR HYDRAULIC LINE WITH A LARGE HOLE. HYDRAULIC LINE REPLACED AS PER 20-06-03 AMM AND LEAK CHECKS COMPLETED AS PER AMM 32-30-36. AIRCRAFT RETURNED TO SERVICE. HYDRAULIC LINE PN: DSC252B4-0124. AIRCRAFT HOURS:63469, AIRCRAFT CYCLES:81976. (TC# 20190801001)