Rear M1 train doors not proven closed. TC manually opened and closed once to clear fault. Thereafter , fault reccurred at DBG SB. TC manually opened and closed o nce to clear fault. ~~~~~ Rear M1 train doors not proven closed. T     In depot found #1653-B4 door with FC door operation time out CLE.Door was isolated.Normalised door and checked for FOD at door guide rail,no FOD found.Checked doorb resistance,8kgf,satis.Checked DLS and door sensing s/w rigging,satis.Check door mating strip gap,65mm,failed criteria,adjusted to 63.7mm.Cleaned J-rail guide.Conducted door cyclic and timing test,satis. Done by Ong T.W./Arthur Sam. 31/08/21