What was found
(CAN) PILOT DEBRIEF ON FAULT. THEY WERE AT A NORMAL TAXI SPEED HEADING OUT TO DEPART. THEY WERE GOING STRAIGHT WHEN THE CAS NWS FAIL APPEARED. THEY IMMEDIATELY STARTING BRAKING TO SLOW DOWN. AS THE ACFT ALMOST STOPPED THEY FELT THE ACFT WAS TURNING LEFT. THE CREW CALLED THE TOWER TO REPORT A PROBLEM. THE TOWER CONFIRMED THAT THE NOSE WHEELS WERE HARD OVER 90 DEGREE. THE CREW SELECTED THE NWS TO OFF. MESSAGE CLEARED. TURNED NWS ON AND IMMEDIATELY MESSAGE CAME BACK. CREW SHUTDOWN AND AIRCRAFT WAS TOWED TO SERVICE CENTER.