What was found
WHILE AT CRUISE ALTITUDE PIC NOTICED NR 2 ENGINE OIL PRESSURE AT APPROX 40 PSI AND FLUCTUATING. PRESSURE STEADILY DECREASING OVER PERIOD OF APPROX 2 MIN AT WHICH POINT THE RT ENG OIL PRESS LOW INDICATOR ILLUMINATED. CREW RAN CHECKLIST AND SHUT DOWN NR 2 ENGINE. AIRCRAFT LANDED IN LGA WITHOUT INCIDENT. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT AND FOUND THE ENGINE AND SURROUNDING NACELLE COWLING WAS COATED IN OIL. FAULT ISOLATION REVEALED A PACKING ON THE BB AXIS SEAL WAS CUT ALLOWING THE OIL LEAKAGE. THE BB AXIS SEAL WAS REPLACED AND A GROUND RUN WAS PERFORMED WITHOUT LEAKAGE. THE AIRCRAFT WAS RETURNED TO SERVICE.