As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NYLON CAM FOLLOWER MELTED WHERE IT CONTACTED THE CONTACT POINT LEAF SPRING. THE CAM FOLLOWER WOULD NO LONGER OPEN THE CONTACT POINTS, AND THE LEFT MAGNETO FAILED. SUBMITTER STATED POSSIBLE CAUSE, POOR CONDENSER GROUND. REF: TCM IGNITION BULLETIN SB 651. COMPONENT P/N D6LN3200 10-682910-13.