What was found
FLT 3221 - PHL-SBY - AT 1000 FEET ON CLIMB-OUT, THE NR 1 ENGINE OIL PRESSURE WARNING LIGHT CAME ON, OIL PRESSURE AT 20 PSI ON GAUGE. THE CREW SHUTDOWN THE NR 1 ENGINE AND RETURNED TO PHL AND LANDED WITHOUT INCIDENT. INSPECTED THE NR 1 ENGINE, NO METAL CONTAMINATION FOUND IN MAIN OR RGB FILTERS AND CHIP DETECTORS. SERVICED WITH 7 QUARTS OF OIL. LATER AT RON MAINTENANCE, PERFORMED ENGINE OIL FILTER REMOVED AND REPLACED AND REPLACED FORWARD CENTRIFUGAL CARBON SEAL AS A PRECAUTION. (M)