As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED EFIS COMP MON MESSAGE WITH F/O ATTITUDE INDICATION ERRATIC AND NO FLIGHT DIRECTOR OR AUTOPILOT. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, R & R ATTITUDE AND HEADING COMPUTER (AHC) NR 2 AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.