Train doors were not proven closed. TC reported the 'A' side cab door open automatically. TC closed the cab door, fault cleared. Fault did not recur at subseque nt stations. Train doors were not proven closed. TC reported ~~~~~ 3503 Train doors were not proven closed. TC reported the 'A' side cab door open automatically. TC closed the cab door, fault cleared. Fault did not recur at subsequent stations. CE:3503 A/S cab door proven closed.No DIR lit.  #3503 A/S cab door able t close annd no DIR. Further check and found cab door latch overlapping about to pass only (4mm), adjusted to overlapping 6mm. Afer function check ok, also service bottom guide rail when shacking cab door handle, no DIR lot. Done by: Morgan and Kumar. 13/03/2024.