What was found
ORD - FLT 1599 - EN ROUTE EWR/ORD - DURING CRUISE, RECEIVED NR 1 HYDRAULIC SYSTEM LOW QTY ALERT. AIRCRAFT PROCEEDED TO ORD AND ACCOMPLISHED ALTERNATE LANDING GEAR AND FLAPS PROCEDURE, LANDING WITHOUT INCIDENT. REPLACED NR 1 SYSTEM ENGINE HYDRAULIC PUMP SEALS. SERVICED HYDRAULIC SYSTEM. SYSTEM LEAK AND GROUND CHECKED NORMAL OPERATION. (M)