As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUBMITTER STATES A VERY POOR SERVICE FROM AUBURN SPARK PLUGS. HAS NOTED CENTER ELECTRODE PORCELAIN FAILS. FAILED ELECTRODE PIECES THEN CAN CAUSE DAMAGE TO VALVES, SEATS, RINGS, AND PISTONS. SUBMITTER RECOMMENDS TO NOT USE THESE SPARK PLUGS IN AIRCRAFT ENGINES.