What was found
AIRCRAFT HAD TO BE REPOSITIONED POST MAINTENANCE FOR FUELING. WHEN CHOCKS WERE PULLED AIRCRAFT STARTED MOVING AND WOULD NOT STOP USING NORMAL BRAKING. EMERGENCY BRAKE APPLIED TO STOP AIRCRAFT WITHOUT ANY FURTHER INCIDENT. CIRCUIT BREAKERS FOR POWER BRAKES AND ANTI-SKID CONTROL WERE NOTED TO BE EXTENDED. MAINTENANCE RESET THE CIRCUIT BREAKERS, BLED BRAKES AND SERVICED THE NITROGEN SYSTEM. TAXI CHECKS WERE ACCOMPLISHED WITH NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.