TC unable to close'A' side cab after TC came back from short PNR.TC tripped DCB to closed cab do or- ok. ThereafterTC normalised DCB at RFP NB. ~~~~~ 3634 TC unable to close 'A' side cab after TC came back from short PNR. TC tripped DCB to closed cab door- ok. Thereafter  TC normalised DCB at RFP NB. CE:T403(3634) cab door A/s having difficulty in closing electrically(intermittently). Need to operate DCB to close door.  3634 A/S cab door unable to close. When cab door 'CLOSE' push-button was depressed, cab door will move slightly but unable to close fully. Checked door rollers condition - OK. Checked cab door guide rail, no FOD was found. Isolated cab door & checked door movement manually, operation was smooth. Adjusted door actuator close cushioning speed. Cab door able to close fully. Door cyclic 20x & cab door able to open/close fully.  Kwa ZY    44626