What was found
ON FLIGHT 4376, CREW REPORTED RECEIVED HYDRAULIC 2 LOW QUALITY, SOON FOLLOWED BY HYDRAULIC 2 FAIL MESSAGE. CREW DECLARED EMERGENCY GOING INTO ORD. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NUMBER 2 EDMP. REMOVED AND REPLACED NUMBER 2 HYDRAULIC SYSTEM PRESSURE HYDRAULIC LINE. AIRCRAFT RETURNED TO SERVICE.