As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRIC MAGNETO FAILED. TROUBLESHOOT FOUND MAGNETIC PIC-UP CIRCUIT OPEN. REPLACED WITH NEW AND RUN CHECK SATISFACTORY. REMOVED PART APPEARS TO HAVE DEBONDED FROM CYLINDER AND THERE IS EVEDENCE THAT IT CONTACTED THE CRANK TRIGGER. OAT TEMPERATURE WAS JUST BELOW FREEZING.