What was found
FLT NR 1584 - CREW REPORTED DURING CLIMB-OUT, LOST GREEN HYDRAULIC PUMP THEN YELLOW SYSTEM OVERHEAT MESSAGE ILLUMINATED. CREW DECLARED AN EMERGENCY, PERFORMED A MANUAL GEAR EXTENSION AND RETURNED TO FIELD. MX DISCOVERED PTU LINE LEAKING. MX REPLACED LINE, LEAK CHECK WAS GOOD. AS A PRECAUTION, MX REPLACED THE LEFT ENGINE DRIVEN HYDRAULIC PUMP. OPERATIONAL/LEAK CHECK WAS GOOD.