As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED ENGINE RUNS ROUGH IN CLIMB. MAINTENANCE INSPECTED AND FOUND LOW COMPRESSION ON THE NR 2 & NR 3 CYLINDERS OF THE RIGHT ENGINE, COLLAPSED LIFTERS ON THE NR 5 & NR 6 CYLINDERS, AS WELL AS A CRACKED BEARING ON THE NR 3 CYLINDER CONNECTING ROD. BOTH CYLINDERS AND THE NR 3 & NR 4 CONNECTING RODS WERE REPLACED WITH NO FURTHER DEFECTS NOTED.