As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE PILOT SAW INCREASING OIL PRESSURE ON ONE ENGINE. THE PRESSURE WENT INTO THE AMBER AND THEN INTO THE RED. THE THROTTLE WAS PULLED BACK TO IDLE AND THE OIL PRESSURE WENT INTO THE GREEN. THE OIL PRESSURE DROPPED AGAIN INTO THE AMBER AND THEN RED. THE PILOT SHUT THE ENGINE DOWN AND DIVERTED.