As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HIGH EGT DUE TO LEFT MAGNETO FAILURE. TROUBLESHOOTING REVEALED DISTRIBUTOR GEAR COPPER ELECTRODE HAD FAILED. AFFECTED PART K3008 IDENTIFIED IN SLICK SERVICE BULLETIN SB1-15A. HAD ALSO ARCED ACROSS DISTRIBUTOR BLOCK, SHORTING TO TERMINAL #1.