As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INVESTIGATION OF A CHIP LIGHT ON FORWARD CHIP PLUG SHOULD A BUILD UP OF BLACK FUZZY PASTE WITH SOME INDICATION OF FERROUS MATERIAL. ENGINE WAS REMOVED AND DISASSEMBLED. SUBSTANCIAL WEAR WAS FOUND ON ACCESSORY DRIVE GEAR BOX IMPUT PISTON BEARINGS. PARTS WERE ROUTED TO LAB FOR FURTHER INVESTIGATION.