As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT SCHOOL INSTRUCTOR AND STUDENT PERFORMED POST FLIGHT MAG CHECK BEFORE SHUTDOWN. WHEN SELECTING LT MAG, AIRCRAFT STARTED TO FILL WITH SMOKE FOLLOWED BY THE INSTRUMENT BREAKER TRIPPING. AMES FOUND THE PROBLEM TO ORIGINATE AT THE IGNITION SWITCH GROUNDING OUT. SWITCH WAS REPLACED AND FUNCTION TESTED. SYSTEM FOUND TO BE SERVICEABLE. (X)