As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING RUNUP THE PILOT FOUND LT MAGNETO WAS INOPERATIVE. A MECHANIC INSPECTED THE AIRCRAFT AND FOUND THE SLICK START MAGNETO START BOOST BOX STC NR SA593CH MALFUNCTIONED AND GROUNDED THE LEFT MAGNETO OUT. THE MECHANIC REPLACED THE SLICK START BOX; THIS FIXED THE PROBLEM.