As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE OIL PRESSURE BEGAN TO FLUCTUATE AND SLOWLY DECREASED. WHEN GAUGE READING APPROACHED THE LOWER LIMIT THE MASTER CAUTION LIGHT BEGAN TO FLICKER. ENGINE WAS SHUTDOWN AND AIRCRAFT RETURNED TO BASE. MAINTENANCE FOUND A HOLE CHAFED IN THE OIL TO FUEL HEATER TUBE BY THE FUEL PUMP SEAL DRAIN TUBE.