TC reported MCH was jammed at B3 when attempting to depart SBW NB in ATPM mode. TC toggled MS and MC H to no avail. MDZ was removed temporarily for train to depa rt. Train taken out of service at JUR and replacement train ~~~~~ 3644 TC reported MCH was jammed at B3 when attempting to depart SBW NB in ATPM mode. TC toggled MS and MCH to no avail. MDZ was removed temporarily for train to depart. Train taken out of service at JUR and replacement train.(L3). L3 3644 MS Stiffness. Change out 3644 MS bearing (2 sets)due to stiffness. Function tested-OK.No more stiff or MCH jammed. Alan/Lee PT/Anand/Kamarul 44884