As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENG, LT MAGNETO FAILED DURING FLIGHT. ACFT RETURNED TO BASE. REMOVED AFFECTED MAGNETO THAT HAD ACCUMULATED JUST 116.0 HOURS FROM FACTORY REBUILD. THIS REPORT IS ONE OF MANY FAILURES WE HAVE BEEN EXPERIENCING FROM FACTORY NEW REBUILT MAGNETOS. DETAILS OF THIS MAGNETO ARE LISTED BELOW. IN THIS INSTANCE THE DISTRIBUTER BLOCK HAD QUIT TURNING.