As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT, NOTICED NR 2 ENGINE OIL PRESSURE FLUCTUATION FOLLOWED BY STEADILY DECREASING OIL PRESSURE OVER A PERIOD OF SEVERAL MINUTES. ELECTED TO ABORT FLIGHT AND RETURN TO DEPARTURE. PRESSURE CONTINUED TO DECREASE AND EVENTUALLY WENT BELOW RED LINE. DIVERTED, SHUTDOWN NR 2 ENGINE. FOUND OIL LEAK AT REAR BEARING OIL SUMP LINE. REPLACED ENGINE ASSY.