As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SEVERE ENGINE VIBRATION DURING TAKEOFF. QUICK INSPECTION ON GROUND REVEALED THAT LT WAS INOPERATIVE. OPERATOR DECIDED TO REPLACE MAGNETO WITH A BRAND NEW ONE. DURING THE DISASSEMBLING OF THE MAGNETO THE DISTRIBUTOR GEAR`S FAILURE WERE FOUND . IT MIGHT CAUSE AN ENGINE IN-FLIGHT SHUTDOWN, WHICH COULD LEAD TO A LOSS OF CONTROL. MAGNETO DEFECT. MAGNETO REPLACED.