As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER OVERHAULED ENGINE WAS INSTALLED, A LEAK CHECK WAS CARRIED OUT. WHEN AIRCRAFT BOOSTER PUMPS WERE TURNED ON, FUEL POURED FROM THE ENGINE DRIVEN FUEL PUMP THROUGH THE BASE DRAIN LINE. THE FUEL PUMP WAS REPLACED AND THE FAILED PUMP WAS RETURNED TO THE ENGINE OVERHAULER.