As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO LOOKED LIKE NEW FROM OUTSIDE. WHEN REMOVED ALL COMPONENTS INSIDE WERE BURNED UP. NO ROTOR AND ONLY 3 TOWERS OF DISTRIBUTOR WERE LEFT. MAGNETO WAS BURNED UP VERY FAST AND VERY HOT. DESTROYED HALF OF THE HARNESS CONNECTION (PLATE).