What was found
NR 1 HYDRAULIC SYSTEM FAIL INFLIGHT, THE CREWS CONTINUED TO DESTINATION AND FOLLOWED STANDARD EMERGENCY PROCEDURE. AT KBWI MAINTENANCES FOUND NR 1 ENGINE RT HYD. DRIVEN PUMP INOP. THEY REMOVED AND REPLACED NR 1 ENGINE BOTH RT & LT EDP. OP'S & LEAKS CHECK NORMAL, AIRCRAFT RETURNED TO SERVICE.