As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, THE PILOT REPORTED A LOSS IN MANIFOLD PRESSURE ON THE LT ENGINE. VISUALLY THE PILOT SAW SMOKE COMING FROM THE LT ENGINE. THE PILOT SHUTDOWN THE LT ENGINE, RETURNED & LANDED WITHOUT INCIDENT. THE LT ENGINE TURBO CHARGER OIL SEAL FAILED CAUSING THE LOSS IN MANIFOLD PRESSURE & SMOKE. REMOVED & REPLACED LT ENGINE TURBOCHARGER. PERFORMED ENGINE RUN OPS CHECKED GOOD. ALL ENGINE CHECKS WERE NORMAL.