As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF, THE LEFT ENGINE LOST ALL OIL PRESSURE. THE LEFT ENGINE OIL PRESSURE DECREASE WAS NOTICED BY THE FLIGHT CREW DURING LANDING GEAR RETRACTION. FLIGHT RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE. OPERATIONAL CHECK NORMAL.