As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE NR 1 ENGINE BEGAN TO RUN ROUGH DURING CLIMB AND SMOKE WAS NOTICED IN THE EXHAUST DURING CRUISE. THE ENGINE WENT NORMALLY ASPERATED AND SHORTLY AFTER THE CREW NOTICED LOWER THAN NORMAL OIL PRESSURE, AT WHICH POINT THE ENGINE WAS SHUTDOWN AS A PRECAUTION. POST FLIGHT INSPECTION REVEALED A FAILED OIL SEAL IN THE TURBOCHARGER TURBINE CAUSING OIL TO LEAK INTO THE EXHAUST. THE TURBOCHARGER WAS REPLACED.