As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) MAGNETO NOT FUNCTIONING AFTER ENGINE START. DISASSEMBLED MAG, NOTED DISTRIBUTOR BLOCK BURNED AND MELTED. MAGNETO FILLED WITH YELLOW POWDER RESIDUE. EVIDENCE OF ELECTRICAL ARCING BETWEEN COIL AND DISTRIBUTOR BLOCK. NOTED CARBON BRUSH K3215 APPEARED NORMAL AND UNDAMAGED. HEAT DAMAGE NOTED ON MAGNETO HOUSING. MAGNETO BEYOND ECONOMICAL REPAIR.