As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT RUN-UP, PILOT NOTICED OIL PRESSURE LOWER THAN NORMAL. MAINTENANCE FOUND METAL IN OIL SCREEN. ON TEAR-DOWN INSPECTION, FOUND NR 3 PISTON PIN BROKEN IN HALF WHICH CAUSED PISTON TO BREAK AND SUBSEQUENT DAMAGE TO CONNECTING ROD AND CRANKCASE.