As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4066 PERFORMED AN AIR RETURN DUE TO RECEIVING A RIGHT HAND OIL PRESSURE CAS MESSAGE. MAINTENANCE INSPECTED BUT COULD NOT DUPLICATE THE PROBLEM. MAINTENANCE CLEANED THE CANNON PLUGS. A FUNCTIONAL CHECK FLIGHT WAS BUILT FOR THE AIRCRAFT AND THE AIRCRAFT CHECKED GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE AND REPOSITIONED TO WASHINGTON NATIONAL.