What was found
HYD G RSVER LOW AIR PRESSURE, FOLLOWED BY A TOTAL LOSS OF G HYD SYSTEM, DIVERTED, ON ARRIVAL , INBOUND CREW STATED THAT NO G HYD QTY, HYD FLUID WAS COMING OUT FROM NR 2 ENG DRAIN MAST , NR 1 HYD PUMP. PRESSURIZED GREEN HYD RESERVOIR IAW AMM 29-14-00-614-804-A01. UNABLE TO PRESSURIZE G RESERVOIR. FOUND AIR LEAK FROM GREEN RESERVOIR. PRESSURIZATION CHECK VALVE DRAIN. REMOVED CHECK VALVE IAW AMM 29-14-31-000-801-A. FOUND CHECK VALVE PARTIALLY STUCK OPEN. REMOVED GREEN ENG HYDRAULIC PUMP IAW AMM 29-11-51. INSTALLED NEW CHECK VALVE ON GREEN RESERVOIR IAW AMM29-14-31. INSTALLED NEW EDP IAW AMM 29-11-51. REPLACED CASE DRAIN FILTER ASSY ON GREEN SYS, NR 1 ENG IAW AMM 29-11-43. PERFORMED LEAK TEST AND NO LEAK NOTED. PERFORMED BLEEDING HYD SYS AND RESET CIRCUIT BREAKER 5JR . ENGINE RUNS PERFORMED , ALL OK, ACFT OK FOR SERVICE.