As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT NR 5737 FROM CVG TO MSN, THE FLIGHT CREW RPORTED: THE RIGHT ENGINE OIL PRESSURE WARNING ILLUMINTED IN FLIGHT. ENGINE WAS SHUT DOWN AS PER QRH PROCEDURE: DECLARED EMERGENCY LANDING AND RETURNED TO THE DEPARTURE AIRPORT. THE LANDING WAS UNEVENTFUL. MAINTENANCE REPLENISHED THE OIL SYSTEM. T/S ONGOING.