As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LOSS OF ENGINE POWER. BEGAN TO RUN ROUGH. MADE A PRECAUTIONARY NORMAL LANDING. MECHANIC REMOVED COWLING AND FOUND A CRACKED NR 4 CYLINDER. LB STATED NEW CYLINDERS WERE INSTALLED AT ENGINE OVERHAUL AT 1481.6 HOURS AGO. THE CYLINDER WAS REPLACED WITH OVERHAULDED ASSY. NR 1 CYLINDER WAS ALSO CRACKED PREVIOUSLY, RESULTING IN A SECOND PRECAUTIONARY LANDING.