As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXIING, PILOT EXPERIENCED A HYDRAULIC HI TEMP CAS MESSAGE ALONG WITH THE HYDRAULIC PUMP CYCLING ON/OFF VERY RAPIDLY AND HYDRAULIC PRESSURE INDICATION VARYING BETWEEN 1700-3600 PSI. PILOT RETURNED TO BLOCK AND SHUT DOWN THE AIRCRAFT.