As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL 36.0, NR 1 ENGINE OIL PRESSURE FLUCTUATING 40-35 PSI WITH OIL PRESSURE LIGHT DOING SAME. OIL PRESSURE WENT TO 25 PSI WITH STEADY LOW OIL PRESSURE LIGHT ON, ENGINE SHUTDOWN, WINDMILLING OIL PRESSURE 15-20 PSI. REPLACED STARTER SEAL PER AMM 80-11-02 & 80-11-00, PERFORMED ENGINE RUN UP, LEAK CHECK NORMAL PER AMM 71-00-00.