As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAGNETO IMPULSE COUPLING FAILED IN FLIGHT. COUPLING PAWS BROKEN FROM BODY AND CAUSED MAGNETO CASE TO BREAK AT MOUNT PAD. MAGNETO MADE METAL INTO ENGINE BEFORE FAILING. WHEN AIRCRAFT PICKED UP AT HANGAR, NO OIL REGISTERED ON DIP STICK.