Testing the door latch is quite easy if you follow Marty's guide. There are only three microswitches, and a cheap Screwfix multimeter will do the job.
https://www.screwfix.com/p/lap-mas8...nQu7BBauT4hvnM6-rrxoChcwQAvD_BwE&gclsrc=aw.ds
Otherwise contact @martyuk and get a replacement latch. Fit it, and enter the EKA.
https://www.screwfix.com/p/lap-mas8...nQu7BBauT4hvnM6-rrxoChcwQAvD_BwE&gclsrc=aw.ds
Otherwise contact @martyuk and get a replacement latch. Fit it, and enter the EKA.