As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB THE CAPTAIN`S, ARCDU, AUDIO AND RADIO CONTROL DISPLAY UNIT FAILED. THE CREW TRIED TO RESET THE UNIT SEVERAL TIMES TO NO AVAIL. DECISION TO RETURN TO DEPARTURE AIRPORT WAS MADE. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE MET THE ACFT AND REPLACED THE ARCDU UNIT, IAW AMM 23-81-01. AFT PROCEEDED WITHOUT FURTHER INCIDENT.