As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING STATION TURN AROUND, MAINTENANCE NOTICED SMALL SPARK COMING OUT OF THE ANTI-COLLISION CONTROL SWITCH (2LV). CIRCUIT BREAKER (5LV) OF THE LOWER BEACON WAS POPPED. FOUND THE ANTI-COLLISION SWITCH CONTACTS 1B AND 2B SHORTED TOGETHER, REGARDLESS OF THE SWITCH POSITION AND SHORTED TO GROUND THROUGH THE SWITCH BODY. SWITCH ASSEMBLY WAS REPLACED.