As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN-FLIGHT SHUTDOWN OF THE NR 2 ENGINE DUE TO LOW OIL PRESSURE CAUTION LIGHT, OIL PRESSURE INDICATION WAS NORMAL. PILOTS INITIATED CHECKLIST AND PERFORMED SHUTDOWN AND RETURNED TO BASE. ENGINE IS A MODIFIED CIS ENGINE. THE PROBLEM WAS FOUND TO BE A DEFECTIVE LOW OIL PRESSURE SWITCH. THE OIL WAS A NORMAL COLOR AND PROPER QUANTITY, THE FILTERS WERE CLEAR. LOW OIL PRESSURE SWITCH REPLACED, SYSTEMS CHECKED, A/C RETURNED TO SERVICE.