Train EB when departing JUR MT and reported cab door was not closed properly after attempt to reclos e cab door. TC was unable to find the velcro strap from the Emergency Response Kit. TC was instructed to isolate cab doo ~~~~~ Train EB when departing JUR MT and repor     Check and confirm #3687-A/S cab door top latch dislogded and cannot find the missing latch.Replace top latch ok.Function test Auto/Manual open/close ok and DMI/DIR ok.Latching above (6mm) pass. Done by koh. 23/08/21