replacing vacuum element on center vent

[erubin]

The center vent vacuum element on my 82 300D Turbo leaks. For now I have it plugged off. How do I change it without having to pull the whole dash out? Can it be rebuilt in place?

If you're sure there is no other way to replace it can someone give me an idea of the difficulty (amount of time) and any tricks or headsup doing it via dash removal. Also any parts I should check/change "while I'm there anyway"

Thanks,
Elliot