As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUA FLT 854 AUA TO PHL. SHORTLY AFTER TAKEOFF, THE LEFT ENGINE OIL PRESSURE DROPPED TO 10 PSI AND HAD A RESPECTIVE DROP IN OIL QUANTITY. THE CREW SHUT DOWN THE LEFT ENGINE AND RETURNED TO FIELD AUA. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE. AT THE SHOP VISIT, IT WAS FOUND THAT THE OIL PUMP DRIVE REAR BEARING FAILED.