Hello Nick,
My name is John and I recently bought an alphad (converted to camper). I am writing to you as the exact same thing that happened to yours has happened to mine. I can't get the back door open and no central locking being biggest problem. (Interior lights also stopped working). I read how you managed to open the back door by removing panel, did this solve the central locking once or all the time, or did you have to keep presses switch in the panel. And did you ever solve the light issue ?
Many thanks
John