Train doors and PSDs opened at BSH SB but ATS Display did not show that train doors was opened. TC c onfirmed doors was opened and no circuit breakers was trippe d. ~~~~~ Train doors and PSDs opened at BSH SB bu     Downloaded ER on PTU006.Checked Tims,From ER,at 1800hrs when train was still dwelling in depot,#3634 DIRBS was shown to be activated.#3634 DIRBS was "ON" throughout service.No door related FCs observed during the timing of fault occurrence.Checked #3633 cab,DCB tripped DIRBS-activated.Normalised and sealed ok.Checked all circuit breakers are in normal position,all switches are sealed/unsealed for both cabs-ok.Carried out door function check,satis Done by Joshua. 24/12/21