Staff(NEW) feedback door #19 did not open. Staff(NOV) checked and feedback door #19 slow in opening.Train taken out of service at JUR. Replacement train from U PD. ~~~~~ 1608 Staff(NEW) feedback door #19 did not open. Staff(NOV) feedback door #19 slow in opening. Train taken out of service at JUR. Replacement train from UPD. CE : Unable to board.  1608 B2 door checked/found door wobbling. Found both RHS/LHS outer door rollers damaged - replaced. Cleaned J-rail/guide rail & found no FOD. Door gap measured within criteria (63.8mm). Manually push/pull door & door did not wobbled. Door cyclic test 20x,all doors proven closed & DIR extinguished.  Aliff/Redzwan 45135