As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OIL CHANGE, MECHANIC NOTICED LARGE CHIP IN OIL SCREEN. UPON REMOVAL AND EXAMINATION OF ENGINE ACCESSORY CASE, BOTH MAGNETO IDLER SHAFTS MOUNTING HARDWARE WAS FOUND TO BE LOOSE. THE CHIP AND SAFETY WIRE CAME FROM ONE OF THE IDLER SHAFTS, THE SECOND SHAFT'S HARDWARE WAS LOOSE BUT HAD NOT SEPARATED FROM THE ENGINE.