As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED A VIBRATION FROM THE RIGHT ENGINE, 30-40 SECONDS INTO FLIGHT. MAINTENANCE INSPECTED AND FOUND THE RIGHT ENGINE NR 6 CYLINDER TO HAVE LOW COMPRESSION AND THE EXHAUST VALVE SHOWING SIGNS OF CRACKING. REPLACED THE CYLINDER AND OPS CHECKED GOOD.