As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 6478 DTW TO SLC DURING CRUISE ENCOUNTERED AVIONICS MAU 1 FAIL. QRH FOLLOWED. DIVERTED TO DSM. NO FURTHER INCIDENT. OVERWEIGHT LANDING REPORTED. OCM RESET POWER AND MAU1 FAIL MSG CLEARED, ALSO HAD A FLT CONTROL FAULT ON POWER UP; PERFORMED RTS. SIGNED OFF OVERWEIGHT LANDING, NO INSP NEEDED, SINK RATE WAS REPORTED AT 200 FPM.