All train doors were unable to open in all modes.despite using the side pillar buttons. TC depress ed close door buttons followed by open door buttons but to n o avail. Staff (AMK) operate ESDC, TC shut down and open up ~~~~~ All train doors were unable to open in a     From LDC logs,ATS playback & ER confirmed that TC was attempting to open 3556/B/S & 3555/A/S doors while occupying *3556 cab.Check & found 3556 B/S console door open push button (RHS) was faulty(LO in open/close contact position) Replace push buttons contact block ok.Further checks on DORA1-1,DORA1-2 ,DORA1-3,DOZRA,DORA2-1,DCRA1-1,DKA,ZVAR2,TLSK & COR3 relays/contacts ,ok.Main line testing to test door function ok. Done by Arthur Sam. 17/3/22