What was found
(CAN) PRIOR TO ENTERING ETOPS AIRSPACE, THE CENTER HYDRAULIC WARNING LIGHT CAME ON, THE CREW WAS CONNECTED TO MAINTENANCE AND THRU A DISCUSSION THEY WERE ABLE TO EXTINGUISH THE WARNING LIGHT. HOWEVER THE PRESSURE WAS STILL LOW, BUT WITHIN NORMAL VALUES AND THE CENTER HYDRAULIC WARNING LIGHT REMAINED OFF. THE CAPTAIN DIVERT THE FLT, AND BASED ON MAINTENANCE AND PASSENGER HANDLING YYZ WAS CHOSEN BY THE DISPATCHER AND SOC AS THE BEST PLACE FOR THE A/C. FIM 29-11-00-815-812, FIG 111 CARRIED OUT, FOUND ADP MODULE WITH INTERNAL LEAKAGE. REPLACED ADP FILTER MODULE IAW AMM 29-11-19, PB 401, CHECKED SERVICEABLE.