As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 1 ENGINE WAS RUNNING ROUGH AT CLIMB POWER ABOUT FOUR MINUTES AFTER TAKE OFF, THE ENGINE CONTINUED TO RUN ROUGH AT REDUCED POWER. THE PILOT SHUT DOWN THE ENGINEAND SECURED IT AND RETURNED TO BASE WITHOUT INCIDENT. MAINTENANCE FOUND TRACES OF OIL IN THE INTAKES AND THE CYLINDERS WHICH POINTS TO THE BLOWER SEAL. ENGINE CHANGE SCHEDULED.