As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE STARTED TO RUN ROUGH AND BACKFIRE IN-FLIGHT. ENGINE SHUT DOWN AND AN UNEVENTFUL LANDING WAS MADE. INVESTIGATION FOUND NR 2 CYLINDER CRACKED. CYLINDER WAS REMOVED AND REPLACED WITH A YELLOW TAGGED UNIT. ENGINE GROUND RAN, CHECKED SATISFACTORY. AIRCRAFT RETURNED TO SERVICE. SUSPECT FATIGUE AS CAUSE OF CRACK.