As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE, NR 2 ENGINE BEGAN BACKFIRING REPEATEDLY ENGINE SHUT DOWN AND SECURED AND LANDED MDPC WITH NO INCIDENT. FOUND NR 4 CYLINDER CRACKED. REMOVED AND REPLACED WITH SERVICEABLE CYLINDER ASSY. AIRCRAFT RETURNED TO SERVICE. (M)