As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CASTROSPHOIC ENGINE FAILURE AFTER TAKEOFF. EMERGENCY LANDING WAS EXECUTED WITHOUT INCIDENT. ENGINE WAS DISASSEMBLED, REVEALING NR 5 PISTON DISINTEGRATED. ENGINE HAD BEEN OVERHAULED APPROXIMATELY 280 HOURS AND 3.5 YEARS PRIOR TO FAILURE. ALL PISTONS HAD BEEN REPLACED WITH NEW AT OVERHAUL. PARTS WERE SUBMITTED TO THE MANUFACTURER FOR ANALYSIS.