As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED SEEING SMOKE COMING FROM THE SWITCH ON START UP. ENGINE SHUTDOWN AND ACFT ROUTED TO MAINTENANCE. NO LOOSE WIRES OR CONNECTIONS FOUND AT SWITCH AREA. CAN SMELL BURNED ELECTRONICS INSIDE SWITCH. SWITCH REPLACED AND SYSTEM OPERATED NORMALLY. ACFT RETURNED TO SERVICE.