TC reported TIMS showed Obstacle Detected at car 1615 when train doors opened. Alarm self-cleared af ter train doors closed. Fault did not recur at subsequent st ations. TC reported TIMS showed Obstacle Detected at car 161 ~~~~~ TC reported TIMS showed Obstacle Detecte     During cyclic test found #1615-B3 door intermittent showing obstruction.Further check on door found LHS door feels heavy and rolling not smooth.0020 to remove door leaf and check rollers. Checked by Lincoln Koh. 17/10/22 To remove door leaf and check rollers. Check and confirm LHS rollers delaminated c/o ok.Door function test ok. Done by Arthur Sam. 18/10/22