As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT AT APPROXIMATELY FL200, CREW OBSERVED LOW OIL PRESSURE LIGHT ON NR 2 ENGINE. OIL PRESSURE DECAYED TO 15 PSI, QUANTITY WAS 2 QTS AND TEMPERATURE STAYED IN GREEN BAND. ENGINE WAS SHUT DOWN AND SECURED PER COM PROCEDURES. THE APPROACH AND LANDING WAS UNEVENTFUL. REPLACED NR 2 ENGINE OIL PUMP AND SERVICED WITH OIL. ENGINE RUN AND LEAK CHECKED OK.