As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GROUND RUN AFTER THE FIRST START OF THE DAY THE ENGINE CHIP LIGHT ILLUMINATED. MAINTENANCE INSPECTED THE UPPER AND LOWER ENGINE PLUGS AND FOUND 1 SLIVER ON THE UPPER PLUG. A 30 MINUTE GOUND RUN WAS PERFORMED AND THE PLUGS WERE RECHECKED AND FOUND CLEAN. THE ACFT WAS RELEASED TO SERVICE.