TC reported DIR illuminated intermittently with no DMI and no additional fault indication. ATS alarmshowed 'Train door 0 status lost while train is moving'. St aff(NOV) boarded T255 to sweep through train and reported no ~~~~~ TC reported DIR illuminated intermittent     Checked and found #3518 A/S door trigger DIR with no DMI/Tims indication.When conducting pull test.Adjusted cab door sensing s/w plunger-no more spurious DIR trigger when cab door is pulled when latched.DIR/DMI/Tims indications satis.Checked all other cab doors ok.Saloon door cyclic test x10-DIR/DMI/Tims indication ok.Checked both cabs DIRS normalised sealed. Done by Lim J.H.  28/02/22