What was found
(CAN) ON DEPARTURE FROM YVR, WHEN GEAR SELECTED UP, HYDRAULIC `A` SYSTEM FAILED. HYDRAULIC QUANTITY INDICATION 0, HYDRAULIC PRESSURE INDICATION 0. CREW EXTENDED GEAR IN ACCORDANCE WITH FLIGHT MANUAL PROCEDURES. THE AIRCRAFT RETURNED TO YVR, STOPPED ON THE RUNWAY AND WAS TOWED OFF THE RUNWAY DUE TO NO STEERING DUE TO HYDRAULIC LOSS. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE LT MAIN GEAR ACTUATOR "UP" LINE HAD FAILED. THE LINE WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE. (TC NR 20081222003).