TC reported train doors at Rear M2 car were slow in closing. Staff(ADM) checked and confirmed Rear M 2 car 'B3' doors were slow in closing. Fault recurred at sub sequent stations. Staff(YIS) assisted to isolate the defecti ~~~~~ TC reported train doors at Rear M2 car w     #2505-B3 door speed adjust and check door open/close timing test ok. Done by Kalees. 02/01/23