What was found
(CAN) DURING CRUISE THE CREW RECEIVED AN INDICATION THAT THE GREEN HYD SYS WAS LOSING FLUID & EVENTUALLY SHOWED A QTY OF ZERO. THE CREW PREPARED FOR A LANDING AS IF THE GREEN SYS WAS UNAVAILABLE. UPON EXTENDING THE LG THERE WAS AN INCREASE IN GREEN SYS FLUID LEVELS &THE CREW PERFORMED AN UNEVENTFUL LANDING & NORMAL TAXI INTO THE GATE. REMOVED THE ACFT FROM SERVICE FOR INSPECTION. FOUND GREEN ENG DRIVEN PUMP PRESS FITTING O RING DETERIORATED & DISPLACED. GREEN EDP REPLACED IAW AMM 29-11-51 PB 401. GREEN SYS HP FILTER SERVICED IAW AMM 29-11-45-610-001-A. GREEN SYS LP FILTER SERVICED IAW AMM 29-11-44-610-001-A. OPERATIONAL TEST OF THE GREEN HYD SYS CARRIED OUT IAW AMM 29-11-00-710-001-A, NO FAULTS FOUND.