Passenger feedback to staff(YWT) that T213 car 2679 train doors slow in closing. Staff(WDL) checked and confirmed no abnormalities. Passenger feedback to staff( YWT) that T213 car 2679 train doors slow in closing. Staff(W ~~~~~ To check 2679 A1 door roller.  2679 A1 door roller checked/found - OK. Found door operating mechanism intermittent fault. Replaced the door operating mechanism. Function check - OK.  Alan/Lee PT 44785 #2679 A1 door operating mechanism S/N : OLD : 1602W020011S011 NEW : D18YF008S008 2679 Passenger feedback to staff(YWT) train doors slow in closing. Staff(WDL) confirmed no abnormalities.  679/680 ER D/L & found no abnormalities. Cab occupied at #3679 with A/S door command in operation during time of report of fault. No FC. Checked #2679 A/S motor current - Satis. Door timing - Satis. During door cyclic test, found #2679 A1 door intermittently unable to open fully. OPS 20 raised to remove door & check on roller.  Lee JC 44785