What was found
ORD - FLT 1795 - DURING CRUISE, EN ROUTE MSP/ORD, SYSTEM 1 HYDRAULIC LOW QUANTITY ALERT ON RIGHT MFDU ILLUMINATED. SYSTEMS 1 AND 2 PUMPS TURNED OFF WITH 35 PERCENT QUANTITY REMAINING IN SYSTEM. ALTERNATIVE GEAR PROCEDURE USED. LANDED ORD WITHOUT INCIDENT. REPLACED NR 1 ENGINE PRESSURE LINE O-RING ON HYDRAULIC PUMP. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)