As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON DEPARTURE, CREW REPORTED SMOKE COMING OUT OF TRANSPONDER PANEL WHEN LIGHT OVERRIDE SWITCH SELECTED ON. TRAFFIC CONTROL ALERT SYSTEM/AIR TRAFFIC CONTROL PANEL REPLACED, WIRING AND CONNECTOR CHECKED NO TRACE OF BURN, SYSTEM SERVICEABLE.