As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE IN FLIGHT OIL PRESSURE WENT TO 300 PSI, ENGINE WAS SHUTDOWN AND ACFT RETURNED TO BASE. WITH ENGINE SHUTDOWN ENGILE OIL PRESSURE READ 270 PSI. OIL PRESSURE SENSOR WAS SWAPPED WITH NR 2 ENGINE AND ENGINE READ 270 PSI WITH ENGINE SHUTDOWN. NEW SENSOR WAS INSTALLED AND ACFT RETURNED TO SERVICE.