As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INVESTIGATION OF UNUSUAL OPERATION OF INSIGHT GRAPHIC ENGINE MONITOR, DISASSEMBLED RIGHT MAGNETO AND FOUND DISTRIBUTOR GEAR TERMINAL PARTIALLY WORN AWAY AND INSIDE DIAMETER OF DISTRIBUTOR BLOCK SCRAPPED AND GROOVED. OBTAINED NEW OEM BLOCK AND GEAR, OEM DISTRIBUTOR BLOCK WALL THICKNESS IS THINNER THAN ELECTROSYSTEMS DISTRIBUTOR BLOCK WALL THICKNESS. INSTALLED NEW PART AND VERIFIED CLEARANCE BETWEEN BLOCK AND DISTRIBUTOR GEAR.