As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DEPARTURE, DUE TO AFTER SELECTING WEATHER RADAR DURING CLIMBOUT, RDR WENT INTO TEST MODE AND COULD NOT RESET ATLMS, WITH WEATHER ENROUTE. CORRECTIVE ACTION; MTC REPLACED THE CONTROL PANEL AND TRANSCEIVER. NOGO ODI COMPLIED WITH.