As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE OIL PRESSURE WENT BELOW MIN PRESSURE NO OTHER INDICATORS. ENGINE SHUTDOWN .RETURN TO FIELD. SUPPLEMENTAL DATA UPDATE FOUND ENGINE DRIVEN HYDRAULIC PUMP DRIVE O-RING DAMAGED, ALLOWING OIL TO ESCAPE PASSED O-RING AND OUT THE OVERBOARD DRAIN. REPLACED O-RING