As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, THE NUMBER ONE COMM UNIT FAILED TO OPERATE. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REPLACED THE NUMBER ONE COMM UNIT, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 23-10-00. OPERATIONAL CHECKS WERE COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.