As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE ROLL DOWN JUST AFTER TAKE-OFF. AFTER LANDING, ENGINE WOULD ONLY START ON LT MAG. DETERMINED THAT THE IGNITION VIBRATOR WAS SHORTING RT MAG DUE TO AN INTERNAL FAILURE. ALSO FOUND LT AND RT MAGS P-LEADS GROUND FAULTING TOGETHER THROUGH AN IGNITION FILTER MOUNTED IN FIREWALL. SPECULATED THAT CAPACITORS (SPRAUGE 10283-64 & 1032364B) IN THE FILTER SUFFERED CORROSION AND MOISTURE CONTAMINATION TO PROVIDE ADDITIONAL GROUND TO BRING BOTH MAGS DOWN.