Rear cab "B" side cab door not fully closed. Staff(JUR) opened and closed -ok. ~~~~~ 3526 B/S Rear cab door not fully closed. Staff(JUR) opened and closed - ok.  3526 no related FC recorded. Checked door latch & door mounting bolts/screws - OK. Found J-rail dirty & cleaned J-rail/guide rail. Door roller checked - OK. Function check cab door open/close operation - OK. All doors proven closed & no DIR lit up.  Sarma/Alan/Aliff 45131