I have several of these thermostats that I pick up at the "Pick A Part" yard. Would be happy to donate a couple to Don Foster for developing a repair method.
Who is he and how do we contact him?
Also , since these are so troublesome why not just go to manual control with a rheostat (and maybe a resistor to limit voltage to prevent burned buns) from Radioshack for a couple of bucks and a turn knob where you can set the temperature to your own liking. It's just a matter of providing the right amount of voltage to the heating pads. Sometimes a lot is to be said for simplicity.
I actually put sheepskins from Comfy in Santa Monica on the seats in my daughters 89 740 .Internet price of $99 for two because they are sewn from smaller pieces. Warm in winter , cool in summer. They even custom sewed them to fit better while I waited.
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