Train doors at car 1639, B side were notproven closed. TC recycled train doors once - ok.subseque nt stations. ~~~~~ Train doors at car 1639, B side were not     #1639-B/S doors operation ok.FOD not found.Door static test ok.Door cycle test no wobbling and no rubbing mark.Push pull and door mating gap within criteria.DLS red line ok.DLS cushion rubber intact.Service J-rail & guidw rail.Portulate FOD dislodged when TC cycle door once. Done by Luke. 20/03/23