Snap: 3643 Door not opening at station. ~~~~~ Snap : 3643 Door not opening at station. CE : 3643 All doors proven open and closed - No fault.  3643 B4 door no door FC on TIMS. Checked door lock s/w plunger, found no abnormalities. Sw3apped DCPfrom #3643 B4 door to #3643 A4 door for monitoring. Found #3643 B4 door both door leaf rollers delam. OPS 20 raised to follow-up. DCP S/N : B4 door : 1508W020021S034 A4 door : 1508W020021S005  Daniel/Aliff/Chan SW 45462 3643 B4 Door Roller (outer) delam on both door leaf.  3643 B4 door replaced all 4 door rollers. Cleaned J-rail & guide rail & found no FOD. Weather strip & door gap (64.1mm) checked - OK. Door cyclic test & door open/close timing checked - OK. All doors were proven closed & no DIR lit up.  Sarma/Alan/Lee PT/Kamarul 45462