As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LOW OIL PRESSURE/IFSD DURING FLIGHT, THE ENGINE OIL PRESSURE GRADUALLY DROPPED INTO THE YELLOW BAND, THE CREW ELECTED TO SHUT THE ENGINE DOWN BEFORE RETURNING TO THE DEPARTURE AIRPORT WHERE AN UNEVENTFUL SINGLE ENGINE LANDING WAS PERFORMED. POST FLIGHT INSPECTION FOUND NO EVIDENCE OF EXTERNAL LEAKAGE. TROUBLESHOOTING IS ON-GOING.