Which workshop are you using?
I know most of the VAG specialist workshops really only want to service the modern cars as they're quick and (relatively) easy $.
I'd probably recommend looking for a decent auto electrician rather than taking it to a general mechanical workshop as it sounds like you're chasing an electrical problem/gremlin (unfortunately mk4's have a few). Perhaps talk to German Auto and/or AVW and ask them who the'd recommend. I'm sure they would probably prefer to handball this sort of work anyway.
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