As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MANIFOLD PRESSURE OSCILLATED UNCONTROLLABLY FOR 30 SECONDS. REDUCING POWER MAY HAVE STOPPED OSCILLATION. OCCURRED DURING CLIMB AFTER INITIAL POWER REDUCTION. NO FURTHER PRECAUTIONARY PROCEDURES REQUIRED DURING FLIGHT, EXCEPT TO HAVE THE ENGINE INSPECTED AS SOON AS POSSIBLE. INSPECTION REVEALED A CRACK WHERE THE RIGHT TURBOCHARGER ATTACHES TO THE ENGINE OIL SUMP SO AIRCRAFT WAS REMOVED FROM SERVICE PENDING INVESTIGATION BY ENGINE MANUFACTURER.