As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT ENGINE STARTED RUNNING ROUGH IN CRUISE FLIGHT. PILOT MADE A PRECAUTIONARY BEACH LANDING. TROUBLESHOT, FOUND LT MAG TO BE INOPERATIVE. REMOVED MAG TO BE SEIZED. DISASSEMBLED MAG AND FOUND LOWER BEARING PN M3006 TO BE SEIZED. MAGNETOS WERE APPROX 58 HRS FROM SCHEDULED 500 HR INSP.