As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE, THE CREW NOTICED THE OIL PRESSURE INDICATION ON NR 1 ENGINE WAS LOW. THE ENGINE WAS SHUT DOWN. THE AIRCRAFT RETURNED TO ITS DEPARTURE POINT. THE OIL PRESSURE TRANSMITTER WAS CONFIRMED AS THE FAULT AND WAS REPLACED.