What was found
ON FLT 2453, STEERING INOP CAUTION MESSAGE AFTER ARMING THE SYSTEM. ACCOMPLISHED RESET PROCEDURE IAW MX CONTROL. MESSAGE WENT AWAY FOR APPROX 30 SECONDS. ACCOMP RESET PROCEDURE A SECOND TIME IAW MTX CONTROL AND RETURNED TO GATE. MX INTERROGATED MDC FAULT HISTORY. FOUND (NWS ECU NO NWS A BUG TO DCU) (L NWS ACT LVDT OPEN OR SHORT) (R NWS ACT LVDT OPEN OR SHORT). REMOVED AND REPLACED RT STEERING ACTUATOR/LVDT REF TASK 30-52-01-000-801 AND TASK 32-52-01-400-801-A01. LEAK CHECK OF ACTUATOR GOOD, OPS TEST IAW 30-51-00-710-801, OPS CHECK GOOD. REMOVED AND REPLACED PILOTS CONTROL HAND WHEEL, GROUND TAXI AIRCRAFT, TAXI CHECK GOOD. OPERATIONAL CHECK FLIGHT GOOD. AIRCRAFT RETURNED TO SERVICE.