What was found
(CAN) WHILE ENROUTE BOTH THE STARBOAD AND PORT HYDRAULIC PUMP LOW FLOW WARNING LIGHTS ILLUMINATED AND THE SYSTEM PRESSURE DROPPED TO ABOUT 1600-1700 PSI AND SEEMED TO STABILIZE AT THAT RANGE. AIRCRAFT WAS DIVERTED TO YXY. THE LANDING GEAR EXTENDED NORMALLY. A LEAK WAS FOUND IN A HYDRAULIC LINE AND THE HYDRAULIC OIL LEVEL HAD DROPPED. THE HYDRAULIC LINE FROM THE HYDRAULIC FILTER IN LT NACELLE WAS FOUND LOOSE, LINE WAS TIGHTENED, FLUID REPLENISHED, HYDRAULIC SYSTEM BLED AND CHECKED, NO LEAKS. AIRCRAFT RETURNED TO SERVICE.