As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING MAG CHECKS DURING GROUND RUN PRIOR TO FLIGHT THE ENGINE QUIT WHEN SELECTED TO THE RT MAG. THE MAG WAS REMOVED, DISASSEMBLED AND THE METAL TAB ON THE DISTRIBUTOR GEAR WAS FOUND BROKEN OFF AND LOCATED WITHIN THE MAGNETO. THIS MAGNETO FALLS UNDER SLICK SB SB1-15.