What was found
(CAN) DURING CRUISE THE FLIGHT CREW OBSERVED THAT THE #2 HYDRAULIC QUANTITY WAS GRADUALLY DEPLETING. ON APPROACH AT FIVE MILES FROM THE DESTINATION THE #2 HYDRAULIC QUANTITY WENT TO ZERO AND THE ISOLATION VALVE LIGHT ILLUMINATED. AN ALTERNATE GEAR EXTENSION WAS PERFORMED, AND THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE TROUBLESHOOTING FOUND THAT THE SUCTION FITTING ON THE #2 EDP WAS LOOSE AND APPEARED TO BE CROSS-THREADED ALSO THE O-RING HAD BLOWN OUT. MAINTENANCE REPLACED THE #2 EDP AND THE AIRCRAFT RETURNED TO SERVICE. HYD PUMP, PN 66173-04, SN K1285. AC HOURS: 8487, AC CYCLES: 7537 (TC# 20190430019)