As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LEFT HAND PUSH TO TALK SWITCH FAILED TO OPERATE WHEN SELECTED. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REPLACED THE LEFT HAND PUSH TO TALK SWITCH, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 23-11-00. OPERATIONAL CHECKS WERE COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.