...so what do I do??

I had a battery drain on my 1980 450sl for a while before I was finally able to isolate the power draw to the AC Servo unit (I actually found it coming from connector 33 which is under the passenger kick panel, but that the diagram shows coming from the servo unit). I have read quite a bit about these and know they are a PITA, but I'm about to push forward and try to figure out what the heck is going on with it.

However, before I pull it all out and take it apart, does anyone have any suggestions on what I should look for specifically? I want to try to fix it and see if it is something that can be repaired as opposed to jumping right into a new one. Are there any test, etc that I can do to see a) what is causing the drain, and b) if it can be fixed?

Finally, are there any other components of the climate control system that could be causing this draw?

ANY help would be greatly appreciated!

Zack