As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT RETURNED TO BASE CITING ENGINE FAILURE. ENGINE WOULD NOT START WHEN ATTEMPTED ON GROUND. FURTHER INVESTIGATION REVEALED THE DUAL MAGNETO EXPERIENCED TOTAL BEARING FAILURE. MAGNETO WAS REPLACED AND A FULL GROUND RUN AND LEAK CHECK ACCOMPLISHED. GROUND CHECK APPEARS NORMAL. NOTE: SEVERAL SINGLE ENGINE AIRCRAFT ALSO USE THIS DUEL MAGNETO.