TC reported rear DT car "B" side cab door was open. Staff (JUR) assisted to close for train to depar t. ~~~~~ 3564 TC reported B/S cab door was open. Staff (JUR) assisted to close for train to depart.  3564 B/S cab door slighly stiff during final closing. Clean door guide of dust & dirt. Tested cab door operation - OK. Au TK 45134