Train unable to depart in AM. ATS alarmshowed Obstructed motion on EMU 3507. Reset EB twice - no av ail.ation and all train doors proven closed. Train withdraw to U ~~~~~ 3507 Train unable to depart in AM. ATS alarm showed Obstructed motion on 3507. Reset EB twice - no avail. TC performed brake status check - no stuck brake indication and all train doors proven closed. (L3) L3 3507 found AMR2 contactorfaulty, unable to energise on M/L. Replaced with new AMR2 contactor. M/L test & passed.  Sugu/Lee PT/Hanafi 44700