What was found
PHX - EL - FLT - 057 - WHILE EN ROUTE TO PHX, THE CREW DISCOVERED THAT THE GREEN HYDRAULIC SYSTEM QUANTITY WAS INDICATING ZERO. INBOUND TO PHX THE CREW DECLARED AN EMERGENCY. THE PASSENGERS DID NOT BRACE. THE LANDING WAS UNEVENTFUL. THE FIRE DEPARTMENT EXAMINED THE BRAKES AND NO DISCREPANCIES WERE NOTED. THE AIRCRAFT WAS TOWED FROM THE RUNWAY TO THE GATE. UPON INSPECTION OF THE NR 1 ENGINE, IT WAS DISCOVERED THAT THE NR 1 ENGINE DRIVEN HYDRAULIC PUMP WAS LEAKING. MAINTENANCE REPLACED THE NR 1 EDP. OPERATIONAL/LEAK CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.