I've seen these go out on the early W126's. A fellow member on here sent his in for me to take a look at and I found that a bunch of connectors were broken and a capacitor was loose! Another member on here, Hit Man x, has one with chunks missing from the transistors!

Check out the pics, they are from the first gen cars:
http://www.peachparts.com/shopforum/tech-help/321019-inside-box-w126-automatic-climate-control-first-gen.html

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