As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO UNIT BECAME INOPERATIVE. DISASSEMBLED MAG AND REMOVED COIL. FOUND COIL CRACKED AND ARCING THROUGH TO HOUSING. INSTALLED NEW COIL, CHECKED AND SET E-GAP, REASSEMBLED AND TEST RUN UNIT, ACCEPTABLE. COIL WAS OF NEW BLACK TYPE NR M3975 (MFG DATE 5-11-94).