Yeah, good luck finding someone that knows thee cars there. The hard vac lines should be fine, those connectors are easily replaced, no talent needed, I know, because I've done a few!
If you take the doors locks out of the equation, you may be able to live with it and no other problems.
The heater vac controls the flaps opening, your climate control unit itself may be failing.
The weather stripping is sure to be high, a specialty piece, any body shop can install it. I have heard of someone replacing it, and still have a slight leak.
And welcome.

__________________
83 SD

84 CD