As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TURBOCHARGER WOULD NOT OBTAIN MANIFOLD PRESSURE AT CRITICAL ALTITUDE. TURBOCHARGER EXHIBITS NOTICEABLE RADIAL PLAY AND DRAGGING. THE COMPRESSOR OIL SEAL APPEARS TO BE DEFECTIVE. OIL IS BYPASSING THE SEAL BEING FORCED INTO ENGINE INDUCTION SYS. TURBINE WHEEL SHOWS CONSIDERABLE WEAR AND EROSION.