As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, FLIGHT CREW RECEIVED 'HYDRAULIC SYSTEM CONTROLLER AUTO INOP' WARNING. FLIGHT CREW RETURNED TO GATE WITHOUT FURTHER INCIDENT. MAINTENANCE PERSONNEL CONFIRMED HYDRAULIC SYSTEM CONTROLLER FAILED. REMOVED AND REPLACED HYDRAULIC SYSTEM CONTROLLER. GROUND TEST OK. AIRCRAFT RETURNED TO SERVICE. (X)