What was found
ON FLIGHT 4512 CREW REPORTED ON CLIMB-OUT THEY RECEIVED A ENGINE 2 REV FAIL MESSAGE. CREW DECLARED AN EMERGENCY AND PERFORMED ENGINE NUMBER 2 SHUTDOWN. AIRCRAFT LANDED UNEVENTFULLY IN ORD. AIRCRAFT REMOVED FROM SERVICE. REOPENED MEL 78-1 AUTH NR 040319M-C. REMOVED AND REPLACED RELAYS K0402, K0404, K0406, K0408 IAW EMB 145 AMM 20-13-02-000-801-A AND 20-13-02-400-801-A. OPERATION CHECK GOOD, MEL 78-1 RESTORED. AIRCRAFT RETURNED TO SERVICE.