As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED RIGHT ENGINE VIBRATING ON FINAL APPROACH AND TAXI. MAINTENANCE INSPECTED AND FOUND NO COMPRESSION ON THE RIGHT ENGINE NR 4 CYLINDER. UPON REMOVAL DISCOVERED THE EXHAUST VALVE HAD CRACKED AND BROKEN. THE CYLINDER WAS REPLACED WITH NO FURTHER DEFECT NOTED.