As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GROUND RUN, NOTED THE LEFT MAG HAD NO RPM DROP DURING A MAG CHECK. SWITCHED THE LEFT MAG OFF AND THE ENGINE STAYED RUNNING. CHECKED THE IGNITION SWITCH SYSTEM AND DETERMINED IT TO BE CONNECTED AND OPERATING PROPERLY. REPLACED THE CAPACITOR AND THE SYSTEM OPERATIONAL CHECKED OK.