As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE OIL FILTER INSPECTED DURING 100 HOUR INSPECTION, FOUND EXCESSIVE AMOUNT OF ALUMINUM FLAKES IN FILTER. CAUSE OF METAL IN OIL FILTER TRACED TO NR 6 CYLINDER PISTON PIN PLUG. WHEN CYLINDER WAS REMOVED THE FWD PLUG HAD EXCESSIVE WEAR. THIS WAS A FACTORY REMANUFACTURED ENGINE AND THIS CYLINDER WAS NOT REMOVED SINCE REMANUFACTURE. THE PISTON PIN PLUGS WERE REPLACED AND THE CYLINDER OVERHAULED & REINSTALLED. NO MORE METAL HAS BEEN DETECTED IN THE OIL FILTER.