What was found
(CAN) PILOT REPORTED LOW ENGINE POWER AND SUCKING SOUND ON SHUTDOWN. #3 CYLINDER EXHAUST VALVE SEAT OUT OF POSITION KEEPING VALVE OPEN.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) PILOT REPORTED LOW ENGINE POWER AND SUCKING SOUND ON SHUTDOWN. #3 CYLINDER EXHAUST VALVE SEAT OUT OF POSITION KEEPING VALVE OPEN.