As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) OIL PRESSURE FLUCTUATION/IFSD DURING CLIMB OIL PRESSURE FLUCTUATIONS OCCURRED. THE ENGINE WAS SHUTDOWN AND SECURED AND THE ACFT RETURNED TO THE DEPARTURE POINT FOR AN UNEVENTFUL SINGLE ENGINE LANDING. TROUBLESHOOTING IS ON-GOING.