As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPLACED OPEN COIL(PN K3975) ON LEFT SLICK MAGNETO PN 4301 ON 09-20-2020. MAGNETO UNIT WAS OVERHAULED BY KELLY AEROSPACE, PN 4301R SN F-01242, AND INSTALLED ON AIRCRAFT ON 03-12-2017 AT 3152.94 HOURS TACH. COIL SHOWED NO CONTINUITY (OPEN) AT 193.61 HOURS IN SERVICE. THIS OCCURRED DURING ENGINE RUN UP BEFORE TAKE OFF AND RETURNED TO BLOCKS.