As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED SUCTION SCREEN DURING OIL CHANGE AND FOUND TWO CHUNKS OF ALUMINUM TRAPPED BY SCREEN. INVESTIGATION FOUND THE PIECES HAD BROKEN OFF THE OIL RELIEF VALVE SLEEVE. REASON FOR FAILURE NOT DETERMINED. THERE IS NOT MUCH STRESS ON THIS PART.