What was found
DURING CRUISE, FLIGHT CREW NOTED THE RH HYDRAULIC RESERVOIR QUANTITY INDICATION HAD TURNED WHITE; INDICATING THAT IT WAS ON THE LOW SIDE, BUT THE PRESSURE REMAINED NORMAL. SOON AFTER, CREW NOTED THAT THE QUANTITY WAS DECREASING IN 2 PERCENT INCREMENTS APPROXIMATELY EVERY 5 MINUTES, WITH NORMAL PRESSURE INDICATION. CREW RAN THE CHECKLIST AND CONFERRED WITH MX CONTROL. THE DECISION WAS MADE TO DIVERT TO MSP; CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. UPON INSPECTION OF THE AIRCRAFT, MAINTENANCE FOUND THE PTU SELECT VALVE (P/N: 975284-3) LEAKING. VALVE WAS REPLACED WITH AN INSPECTED UNIT; LEAK AND OPERATIONAL CHECK WAS NORMAL. THE AIRCRAFT WAS RETURNED TO SERVICE.