As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER LANDING THE PILOT NOTICED THE NR 2 ENGINE WAS RUNNING ROUGH AT IDLE. INVESTIGATION FOUND THERE WAS NO COMPRESSION ON #6 CYLINDER. AFTER THE CYLINDER WAS REMOVED IT WAS REVEALED THE EXHAUST VALVE SEAT WAS DISLODGED FROM THE CYLINDER AND HOLDING THE VALVE PARTLY OPEN.