What was found
TOTAL LOSS OF "A" SYS HYD QTY AND PRESSURE WHEN GEAR RETRACTED FOLLOWING TAKEOFF. ON POST FLIGHT DEBRIEF CREW REPORTED THAT WHEN THEY RETRACTED THE GEAR THEY LOST HYD FLUID AND PRESSURE AND THAT THEY HAD TO EXTEND THE GEAR MANUALLY. OPENED ACCESS PANEL 8505. SEARCHED FOR LEAKS COULD NOT LOCATE ANY OBVIOUS LEAKS. SUSPECT ACTUATOR OR LINES GOING TO ACTUATOR. FOUND RETURN LINE WALKING BEAM ACTUATOR LEAKING. REMOVED AND REPLACED BOTH RETURN AND EXTEND HYD LINES REF AMM 20-10-012-4-0.