As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTED ENGINE VIBRATION AND PARTIAL POWER LOSS. UPON LANDING, FOUND EXCESSIVE OIL LEAKING FROM ENGINE. DURING TROUBLESHOOTING INSPECTION, FOUND NR 1 CYLINDER INTAKE VALVE PUSH ROD AND HOUSING BENT. AFTER REMOVING CYLINDER, THE NR 1 INTAKE ROLLER TAPPET WAS FOUND TO BE BROKEN ON ONE ROLLER SUPPORT ARM AND ROLLER DISLODGED. ENGINE WAS REMOVED FROM AIRCRAFT.