As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER APPROXIMATELY 45 MIN OF FLIGHT, RED CAS MESSAGE “R ENG LOW OIL PRES” WAS DISPLAYED IN COCKPIT. OBSERVED A STEADY BUT SLOW INCREASE ON THE RIGHT ENGINE OIL TEMPERATURE. RETURNED TO MAINTENANCE FACILITY. INVESTIGATION REVEALED OIL PUMP SPLINED DRIVE COUPLING TO BE SHEARED. THIS IS THE THIRD OCCURRENCE OF AN OIL PUMP SHEARED DRIVE COUPLING ON THIS ENGINE / ACCESSORY GEARBOX.