As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED DEAD MAGNETO ON SECOND LEG OF TRIP. MAGNETO REMOVED AND BREAKER COMPARTMENT INSPECTED REVEALING THE CAM FOLLOWER ON THE CONTACT POINTS WAS NO LONGER SECURED TO THE SPRING BY THE TWO SMALL STAINLESS STEEL RIVETS. REPLACED CONTACT BREAKER POINTS.