As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MRR-M04-23, NR 2 ENGINE OIL PRESSURE LIGHT CAME ON AS FLIGHT LEVELED OUT IN CRUISE, OIL PRESSURE GAUGE WAS CHECKED AND FOUND PRESSURE DROPPING. CREW DID A PRECAUTIONARY INFLIGHT SHUTDOWN, AND RETURNED TO STATION. LOSS OF OIL PRESSURE DUE TO LOSS OF OIL FRM REAR SCAVANGE PUMP AREA. REMOVED ENGINE, REPLACED SCAVANGE PUMP AND REINSTALLED ENGINE. MFG HAS CHANGED PUMP DESIGN TO DECREASE REAR SCAVANGE PUMP FAILURES. (K)