As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FOLLOWING A FLIGHT TEST THAT WAS CARRIED OUT AFTER ENGINE INSTALLATION. THE PILOT NOTICED AN EXCESSIVE OIL LEAK. THE ENGINE HAD RETURNED FROM OVERHAUL. FURTHER INVESTIGATION REVEALED THAT OIL SEAL WAS NOT INSTALLED. AN EMPTY SPACE WAS CREATED BECAUSE THAT SEAL WAS MISSING, CREATING AN EXCESSIVE OIL LEAK.