TC reported door push button faulty. Press few times to close door manual to no avail. TC did platfo rm duty and put to AM for train to depart. TC reported door push button faulty. Press few times to close door manual to ~~~~~ 3531-TC reported door push button faulty. Press few times to close door manual to no avail. TC did platform duty and put to AM for train to depart.  3531 CAb console A/S button faulty - Replaced. Tested cab door operation for Open/Close & timing - OK. Sarma/ALan/Lee PT/Kamar 44863