As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2567 - EWR TO FPO - DURING CRUISE, ENGINE NR 1 OIL QUANTITY DROP FROM 8 QTS TO 5 QTS IN A LITTLE OVER ONE HOUR. CREW DIVERTED FLIGHT TO RIC. RIC MAINTENANCE REMOVED AND REPLACED OIL PRESS RELIEF VALVE AND SERVICE ENGINE NR 1. OPERATIONAL CHECK AND LEAK TEST WERE PERFORMED SUCCESFULLY. ACFT WAS APPROVED TO RETURN TO FLIGHT.