As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FREEWHEELING UNIT WAS FAILING CAUSING THE MAIN GEARBOX CHIP LIGHT TO INTERMITTENTLY ILLUMINATE. WHEN THE CHIP DETECTORS WERE INSPECTED THERE WAS NO METAL NOTED. NOTHING APPEARED IN THE OIL FILTER OR SCREEN DURING THE SERVICEABILITY CHECK.