As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 ENGINE SHUT DOWN DUE TO NR 10 CYLINDER DOUBLE SHORTED SECONDARY. REMOVED AND INSPECTED NR 10 CYLINDER SPARK PLUGS, FOUND NO DEFECTS. SHORTED NR 10 CYLINDER TO VERIFY TIMING. FOUND TO BE OFF 6 PATTERNS. REMOVED AND REPLACED NR 16 CYLINDER FRONT SPARK PLUG FOR CRACKED CERAMIC AND NR 16 CYLINDER REAR PLUG AND SHORT LEAD. OP CHECKED GOOD.