As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON PREFLIGHT RUN-UP, PILOT NOTICED RT MAGNETO ON NR 1 ENGINE WAS NOT FUNCTIONING. UPON INSPECTION BY MAINTENANCE, THE MAGNETO WAS FOUND DETACHED FROM ENGINE WITH THE MOUNTING FLANGE BROKEN AND STILL ATTACHED TO THE ENGINE. MAGNETO WAS REPLACED WITH NO FURTHER PROBLEMS.