TC reported rear DT car 'B1' door was not proven closed. TC opened and closed a few times to clear f ault. ~~~~~ TC reported rear DT car 'B1' door was no     Checked and found current for door closing to be slighly fluctuating.Cleaned and lubricated J-rail and bottom track guide.Found current graph to be smoothen.Cycled doors and function test,not fault reoccurance.To be monitored. Done by Ting Wei. 28/05/20