As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AS A RESULT OF 2 RECENT CATASTROPHIC MAGNETO IMPULSE COUPLING FAILURES ON OTHER AIRCRAFT IN OUR FLEET THAT RESULTED IN ENGINES BEING REPLACED, THIS MAGNETO WAS REMOVED AND INSPECTED FOR CONDITION OF THE IMPULSE COUPLING. ONE OF THE TWO PAWLS AND IT'S ATTACHMENT RIVET WAS FOUND TO BE EXTREMELY LOOSE AND HAD WORN THE PAWL MOUNTING BACKING PLATE AT THE RIVET ATTACHMENT AREA. A NEW IMPULSE COUPLING WAS INSTALLED AND THE MAGNETO RETURNED TO SERVICE.