As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED PARTIAL POWER LOSS WITH A ROUGH RUNNING ENGINE DURING TAKEOFF ROLL OUT. TAKEOFF WAS ABORTED AND CLEARING PROCEDURES WERE ATTEMPTED. ENGINE PROBLEMS NEVER CLEARED. DURING INVESTIGATION, THE NR 2 CYLINDER WAS FOUND TO BE CRACKED AROUND THE INTAKE VALVE SEAT. CYLINDER WAS REPLACED AND AIRCRAFT WAS RETURNED TO SERVICE.