TC reported obstacle detected at Rear DTcar B3 door. Staff(SBW) checked and confirmed train door di d not open at Rear DT car B3 door. ~~~~~ 3606 TC reported obstacle detected @B3 door. Staff(SBW) confirmed train door did not open at Rear DT B3 door. CE : 3606-B3 not open. Isolated and paste stickers.     3606 B3 FC922 (B3 door open operation timeout) FOD found: N Weather strip condition ok: Y Checked roller condition ok: N,3606 B3 RHS outer roller delam Clean J-rail & guide rail: Y Push/pull door smooth & no wobble: Y, after rectification Door cyclic test 20x, DIR extinguish ok: Y, after rectification TIMS door static timing test pass: Y, after rectification Door lock switch red line flush with surface for positive latching: Y Door close switch actuating plate distance ok: Y Replaced 3606 B3 RHS outer roller.  Sarma/Sugu/Anand/Alan/Kamarul/Shafie 45239