As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AVNX MAU 3A FAULT WHILE CRUISING AT 23,000 FT. ASSOCIATED AP AND ALT FAIL CAUTION MESSAGES. BOTH FMS NAV FELL OFF PFD. MULTIPLE FLIGHT INSTRUMENTS FAILED. DECLARED EMERGENCY, LANDED WITHOUT INCIDENT. PERFORMED POWER RESET FOR 15 MINS. FAULT DID NOT RETURN.