As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED AN ENGINE CHIP LIGHT DURING APPROACH TO LANDING. MAINTENANCE FOUND ACCEPTABLE CHIPS ON UPPER AND LOWER PLUGS. THE PLUGS WERE CLEANED AND REINSTALLED AND A PENALTY RUN WAS PERFORMED. THE PLUGS WERE RECHECKED AND FOUND CLEAN. AIRCRAFT WAS RETURNED TO SERVICE.