Some months ago my Hab door stopped locking with the central locking of the van,a Dethleffs Just 90 on a Fiat 2020. The switch which detects the door is open is screwed near to the door hinge and it operates correctly when door is open/closed. I checked continuity at the wiring connections under Hab seat. I feel the fault lay in the wiring loom either inside the rubber flexi conduit which I can seen passing into the door, or inside the door near the locking machismo. Is there a way of gaining access to insides of Hab door to investigate? Or has anyone a different take on this