As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ENROUTE, CREW OBSERVED THE RT ENGINE WAS RUNNING ROUGH. THE CREW PERFORMED A PRECAUTIONARY IN-FLIGHT ENGINE SHUT-DOWN AND DIVERTED. INSPECTION OF THE RT ENGINE REVEALED THAT THE NUMBER EIGHTEEN CYLINDER WAS CRACKED. THE CYLINDER WAS REMOVED AND REPLACED AND THE AIRCRAFT RETURNED TO SERVICE. (K)