As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GNV - FLT 5069 - RIGHT ENGINE OIL PRESSURE BELOW 55 PSI FEATHERED PROP AND OIL PRESSURE HELD AT 40 PSI 10 MIN LATER IT FELL TO 30 PSI INFLIGHT SHUTDOWN OF RIGHT ENGINE. INFLIGHT EMERGENCY DECLARED. AIRCRAFT LANDED NO INCIDENTS. FOUND ENGINE OIL COOLER LEAKING. REPLACED OIL COOLER IAW DHC-8 MM ATA 72-10. OPERATIONAL LEAK CHECKED OK. (M)