As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) #3 ENGINE WAS SHUTDOWN DUE TO LOSS OF OIL PRESSURE INDICATION. CAUTION LIGHT ILLUMINATED AND THE OIL PRESSURE INDICATED IN THE RED. PRIOR TO THIS THERE WAS A BRIEF OVERSPEED WARNING. UNABLE TO SUPPLY ADDITIONAL INFORMATION TO THE CAUSE AS THE ENGINE IS ON LOAN FROM AVCO LYCOMING AND WILL BE RETURNED AS IS.