As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
.3 HRS INTO HIS TOUR FLIGHT THE PILOT HAD AN ENGINE CHIP WARNING LIGHT. HE MADE AN UNEVENTFULL UNSCHEDULED LANDING. AT ARRIVAL MX FOUND NO CHIP LIGHT ENGINE OFF. MX FOUND (1) 1.5 MM FILAMENT LEVEL "A" ON THE UPPER ELECTRICAL PLUG ALL OTHER PLUGS WERE CLEAN. THE OIL SYS WAS DRAINED AND RINSED IAW THE MX INSTRUCTIONS AND NO FURTHER PARTICLES WERE DISCOVERED. THE ACFT WAS RETURNED TO SERVICE.