What was found
DURING CRUISE, THE CREW REPORTED RECEIVING A NR 1 HYDRAULIC SYSTEM FAILURE MESSAGE ON THE EICAS. MAINTENANCE INSPECTED AND FOUND THE NR 1 ENGINE DRIVEN HYDRAULIC PUMP LEAKING. THE PUMP WAS REMOVED AND REPLACED, SYSTEM HYDRAULICS WERE SERVICED AND THE SYSTEM WAS CHECKED FOR LEAKS DURING THE OPERATIONAL CHECK OF THE PUMP. NO DEFECTS NOTED.