As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT WHILE IN CRUISE FLIGHT THE NR 2 ENGINE HAD CAUSED A VIBRATION AND THE OIL PRESSURE DROPPED TO 40 PSI. THE NR 2 ENGINE WAS SHUT DOWN, AND AN EMERGENCY WAS DECLARED. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPAIRED A STICKING P3/2,5 AIR SWITCHING VALVE AND REPLACED THE PROPELLER SHAFT SEAL. AIRCRAFT RETURNED TO SERVICE.