As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE AT FL230, THE CREW OBSERVED A LOW OIL PRESSURE INDICATION FOR THE LT ENGINE. THEY ELECTED TO SHUTDOWN THE ENGINE AND DECLARED AN EMERGENCY. THE FLIGHT RETURNED TO AIRPORT WITHOUT FURTHER INCIDENT. POST FLIGHT TROUBLESHOOTING FOUND A LEAK ON THE OIL PRESSURE REGULATING VALVE.