As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DISPATCHED TO ON-SCENE REQUEST. EN ROUTE, MASTER CAUTION LIGHT ILLUMINATED INDICATING NR 2 HYDRAULIC FAILURE WITH CORRESPONDING GAUGE INDICATION. PILOT DIVERTED TO NEARBY AIRPORT WHERE AN UNEVENTFUL LANDING WAS MADE. ON THE DRIVE SPLINE OF THE NR 2 HYDRAULIC PUMP HAD FAILED AND ALLOWED THE DRIVE SPLINE TO DISENGAGE FROM THE TRANSMISSION QUILL.