As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH NR 4 ENGINE OIL PRESSURE WAS 30 PSI WITH LOW OIL PRESSURE LIGHT\NON. SHUT DOWN NR 4 ENGINE. WINDMILLING OIL PRESSURE WAS 3 PSI AT 20 PERCENT N2. ENGINE WINDMILLED WITH OIL PRESSURE BELOW 8 PSI FOR 8 MINUTES. REPLACED NR 4 ENGINE OIL PRESSURE RELIEF VALVE IAW PRATT-WHITNEY MM 72-00. OPS AND LEAK CHECKED GOOD.