As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS IN OVERHAUL, A REBUILT TURBOCHARGER WAS INSTALLED ON THE ENGINE AT THAT TIME. THE ENGINE WAS INSTALLED, THE TURBOCHARGER WAS REMOVED DUE TO AN OIL LEAK AND RETURNED. TURBOCHARGER WAS REPAIRED AND REINSTALLED ON THE ENGINE. THE TURBOCHARGER WAS REMOVED DUE TO CONTINUED OIL LEAKAGE. A 2.7500" CRACK WAS FOUND IN THE TURBOCHARGER BACK PLATE.