As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT NOTICED MASTER CAUTION BEGIN TO FLICKER. OBSERVED NR 2 ENGINE OIL PRESSURE BEGIN TO FLUCTUATE AND DROP. EVENTUALLY PRESSURE DROPPED BELOW RED LINE AND ENGINE OIL PRESSURE WARNING LIGHT ILLUMINATED. ON INSPECTION FOUND CUT O-RING ON OIL UNIO OF TURBINE OIL PRESSURE AND SUMP STRUT.