What was found
FLIGHT 4515 TTN-BED. DURING T/O ROLL AT ABOUT 60 KNOTS AFTER RELEASING THE NOSE STEER TILLER, THE A/C TURNED TO THE RIGHT. THE CREW CORRECTED WITH THE TILLER TO APPOX. 80 KNOTS. THE A/C AGAIN TURNED TO THE RIGHT AFTER RELEASING THE TILLER. THE CREW ABORTED THE TAKE-OFF AND RETURNED TO THE GATE. A/C TAKEN OUT OF SERVICE AT 1600(LT). TTN MX INSPECTED NOSE STEERING SYSTEM, DID NORMAL TAXI FUNCTION TEST,FOUND NO DEFECTS. A/C PERFORMED TEST FLIGHT. TEST FLIGHT WAS SATISFACTORY. A/C RETURNED TO SERVICE 7-16-03 AT 2120(LT)