TC reported obstacle detected Rear DT car B3 door. Staff(PNR) monitored until LKS EB, feedback B3 do or did not open, SM(JUR) isolate Rear DT B3 door in closed p osition. ~~~~~ Confirmed 3615 B3 door unable to open. Checked found LHS door leaf, RHS door roller damaged. Replaced both rollers and function test door operation ok. Cycled 20x - ok. Doors are synchronised and open/close speed ok. N.A/mutalib/rizal/01.03.23