As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT ENGINE OIL PRESSURE DROPPED DURING CRUISE AT FL 400. OIL PRESSURE DROPPED ABOUT 1 PSI IAW MINUTE UNTIL IT DROPPED FROM 35 PSI TO 17 PSI IN ABOUT 15 SECONDS. SHUTDOWN THE ENGINE AND LANDED UNEVENTFULLY. AFTER LANDING, THE OIL LEVEL WAS BELOW SCALE AND THERE WAS OIL ON THE ENGINE COWLING AND DRIPPING FROM THE ENGINE.