What was found
(CAN) THE CREW REPORTED THE GREEN HYDRAULIC SYS WAS LOSING FLUID AND SHUTDOWN THE SYSTEM. THE FLIGHT WAS TOWED OFF THE RUNWAY AFTER LANDING. CREW REQUESTED EMERGENCY EQUIPMENT ON STANDBY, ATC ADVISED DISPATCH THAT NO MAYDAY OR PANPAN DECLARED FOUND ON GREEN HYD MANIFOLD REF IPC 29-11-53-03, ITM 20, O RING, DETERIORATED AND LEAKING ON BLEEDER PLUG ITEM 10. REPLACED O-RING, REINSTALLED PLUG AND LEAK CHECK CARRIED OUT IAW AMM 29-11-53-401 SUB TASK 29-11-53-420-054A NO LEAKS FOUND. CONS SERV GREEN HYD TOPPED UP.