What was found
CREW REPORTED AVNX MAU 3A FAIL MSG IN FLIGHT ALONG WITH OTHER EICAS MSGS. CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT INTO MCI. ON CALL MAINTENANCE RESET NIC/PROC 5, PERFORMED RTS TEST, OPS CHECKED RIGHT TR, SPOILERS, BRAKES, A/P, AND A/T SYSTEM PER EMB AMM, ALL OPS CHECKED GOOD. A/C WAS RETURNED TO SERVICE.