As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT NR 3 ENGINE OIL PRESSURE DROPPED TO 30 PSI AND LOW OIL PRESSURE LIGHT CAME ON. EGT WAS 600 DEGREES. WINDMILL OIL PRESSURE WAS 10 PSI FOR 40 MINUTES AFTER SHUTDOWN. CHECKED CHIP DETECTORS, FOUND CLEAN. REPLACED ENGINE MAIN OIL FILTER PER MM 72-61-05. PERFORMED ENGINE RUN-UP. OIL PRESSURE 44 PSI. LOW OIL PRESSURE LIGHT OUT. WINDMILL INSPECTION PERFORMED PER MM 72-00-00.