Train doors at Rear M1 car were not proven closed. TC recycled train doors once - ok. Staff(BBT) che cked and confirmed no train doors abnormalities. Fault did n ot recur at subsequent stations. ~~~~~ Train doors at Rear M1 car were not prov        #1511 checked all doors able to close/open as pernormal.No sign of FOD found.Further checked found #1511-A2 door with slow open/close.Readjusted door cushioning and speed.Function test door #1511-A2 door able to open/closed in good condition. Done by Kamal/Imran. 17/03/23