I have a 1990 Audi 100 that has been parked for about a year or so. When I went to open it the other day I realized that neither the drivers or passengers doors will unlock. The key turns in the lock but it doesn't physically unlock.

I am thinking it must be an issue with the pneumatic central locking and the fact that the car has been parked so long. I would hope that Audi anticipated something like this happening and there is a way to get inside the car. Does anyone know how to get it open?

Thanks,

Marcus