Interesting? Do you have vagcom to see if you can communicate with the 42 door module? The door module does not have CP so all coding and adaptations can be done with vagcom. If you did not store your coding and adaptations, you can get references scans at Ross-tech.com reference scan section. Else, you can ask someone who has a similarly appointed GTI to provide their coding and adaptations. It is not too hard to replace and there should be some DIY on removing door panel. I assume it is out of warranty.