As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING AND DURING ENGINE SHUT DOWN, THERE WAS A PRONOUNCED VIBRATION. AFTER SHUT DOWN THERE WAS ENGINE OIL RUNNING OUT OF THE OIL TANK. MAINTENANCE FOUND A CRACK IN THE ENGINE OIL TANK DRAIN VALVE BOSS WELD. UPON FURTHER INVESTIGATION ONE OF THE TAIL ROTOR ELASTOMERIC BEARINGS WAS FOUND TO BE SEPARATED.