As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED A 200 RPM DROP ON RT MAGNETO. TROUBLESHOOTING REVEALED THAT TOP IGNITION WIRE ON NR 5 CYLINDER WAS UNSERVICEABLE. WHEN HARNESS WAS REMOVED FROM MAGNETO, EVIDENCE OF HEAVY ARCING WAS NOTED IN THE NR 5 LEAD OUTLET AREA OF THE DISTRIBUTOR BLOCK.