As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENCOUNTERED LOSS OF DAU NR 1, DAU NR 2 AND ADC. THIS RESULTED IN THE LOSS OF THE PRIMARY FLIGHT INSTRUMENTATION AND ENGINE INSTUMENTATION. ALSO, LOSS OF FMS. NOTIFIED ATC. ENTIRE SYSTEM RESET ITSELF WHILE RETURNING TO FIELD. PERFORMED NORMAL LANDING. MAINTENANCE REMOVED AND REPLACED THE NR 1 DAU AND RESET THE NR 2 DAU, OPERATIONAL CHECK GOOD.