As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE GEARBOX CHIP LIGHT ILLUMINATED DURING APPROACH FOR LANDING. UPON INSPECTION IT WAS DETERMINED THAT THE UPPER GEARBOX MAGNETIC CHIP DETECTOR HAD ILLUMINATED THE WARNING LIGHT WITH METAL ABOVE THE MAXIMUM ALLOWED. A SMALLER AMOUNT OF METAL WAS FOUND ON THE LOWER PLUG AS WELL. THE ENGINE WAS REMOVED FROM THE AIRCRAFT FOR FURTHER INVESTIGATION AS TO THE CAUSE.