As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, CREW RECEIVED 2/3 HYDRAULIC REVERSIBLE MOTOR PUMP DISAGREE ALERT. FLIGHT CREW ELECTED TO RETURN TO GATE. AIRCRAFT RETURNED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOOTING IDENTIFIED 2/3 HYDRAULIC REVERSIBLE MOTOR PUMP SHUT-OFF VALVE INOPERATIVE. REMOVED AND REPLACED SHUT-OFF VALVE. GROUND RUN - NO FAULT NOTED. AIRCRAFT RETURNED TO SERVICE. (X)