As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE OIL PRESSURE LIGHT ILLUMINATED AND OIL PRESSURE INDICATED ZERO. SHUT DOWN ENGINE AND DIVERTED TO OMA. *S/D* THE STARTER DRIVE BALL BEARING CAGE FAILED. ONE BALL WAS INGESTED INTO THE MAIN OIL PUMP RESULTING IN A SHEARED SHAFT AND ZERO OIL PRESSURE. BEARING THRESHOLD LIMITS HAVE BEEN IMPLEMENTED TO PREVENT SUCH FAILURES IN THE FUTURE.