As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE SHUT DOWN APPROXIMATELY 20 MINUTES OUT OF TUL DUE TO LOW OIL PRESSURE. RETURNED TO TUL. *S/D* THE OIL PUMP FAILED DUE TO LOW OIL PRESSURE. A BOLT FROM THE GEARBOX B LINER BACKED OUT AND BECAME LODGED IN THE OIL PUMP RESULTING IN THE SHAFT SHEARING.