What was found
GSO - FLT 1275 - THE A-SYSTEM HYDRAULIC QUANTITY DECREASED TO ZERO DURING CLIMB-OUT OF GSO. THE FLUID LOSS WAS ACCOMPANIED BY ILLUMINATION OF THE A-HYDRAULIC SYSTEM LOW PRESSURE LIGHTS. A MANUAL GEAR AND FLAP EXTENSION WAS PERFORMED AND THE AIRCRAFT WAS RETURNED TO GSO WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 2 ENGINE DRIVEN HYDRAULIC PUMP LEAKING. THE NR 2 PUMP WAS REMOVED AND REPLACED. THE HYDRAULIC SYSTEM WAS SERVICED TO FULL. LEAK AND OPERATIONAL CHECKS WERE GOOD. (X)