As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED ENGINE CHIP LIGHT ON HIS WAY TO HANGAR. MECHANIC DID THE INSPECTIONS IAW MFG MM AND FOUND A SMALL SINGLE FLAKE ON THE ELECTRIC MAG PLUG WHICH MONITORS THE REAR BEARING OIL RETURN LINE. MECHANIC ALSO THEN FOUND MULTIPLE FLAKES OF PLATEING ON THIS CHIP PLUG. REMOVED THE (ENGINE SN9695) AND INSTALLED (ENGINE SN 9120). SENT ENGINE FOR EVALUATION AND REPAIR.