As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE C/W AD 80-04-0322 DURING AN ANNUAL INSPECTION, LARGE AMOUNTS OF METAL FLAKES WERE FOUND IN THE OIL FILTER. THE FILTER WAS SENT TO LYCOMING FOR ANALYSIS. AT LYCOMING'S RECOMMENDATION, ENGINE WAS REMOVED FROM SERVICE. METAL WAS DETERMINED TO BE ALUMINUM AND AND BEARING MATERIAL. SUBMITTER STATED VERY IMPORTANT THAT ALL OIL FILTERS BY INSPECTED AT EACH OIL CHANGE.