As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO ROTOR HAS TWO POLE MAGNET WITH FIXED LOCATION TO KEY OF ROTOR. KEY WAY IS WHAT ALIGNS THE ROTOR MAGNET POLE LOCATIONS TO THE ENGINE TIMING. MAGNET HAS SHIFTED ON THE ROTOR TO INCORRECT LOCATION CAUSING MAGNETO TO FALL OUT OF TIME WITH ENGINE.