As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TEAR DOWN REVEALED ALL LIFTER BODY HEADS BROKEN OFF AT CAM CONTACT POINT. BROKEN PIECES THEN LODGED BETWEEN CAM LOBES AND ENGINE CASE RESULTING IN THE ENGINE CASE BEING CRACKED AND BROKEN IN SEVERAL PLACES AND LOSS OF ENGINE OIL. SUSPECT INITIAL FAILURE OF NR 2 CYLINDER INTAKE LIFTER BODY. POSSIBLE METAL FATIGUE. PIECES FROM THIS WERE DEPOSITED BENEATH OTHER BODIES CAUSING FURTHER BREAKAGE.