T213 3616(S) Train door at Front DT car ~~~~~ To replace door rollers.  3616 B3 door rollers replaced. Security/function check - OK. No DIR fault after replacement.  Shafie/Sugu 44797 3616 B3 Train door not proven closed. Recycle once - ok. Fault did not recur at subsequent stations. RFP SB CE checked & found 3616 All doors proven open and closed. OE request 3616 B3 train door operational check.  3616 B3 door LHS roller found intermittently stuck. OPS 20 raised to replace door rollers.  Hanafi/Au TK 44797