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It's old -- I'd guess from the mid 80s. Branded Kenmore and made by Frigidaire/Electrolux. It was free. The controls themselves were basic electromechanical things -- the clock/timer doesn't do anything but display time/timer and beep.

When I first got it, I assumed it was driven by AC as many clock ICs once were back in those simpler times.

But then I discovered a small low voltage DC power supply when I was in there installing a PID controller for the oven, so it may actually have something resembling software. Maybe.

And yeah, unresponsive physical controls are a pox. I'm not sure what method you used, but perhaps contacting the companies that design and build the boards might be better than contacting the companies that buy the boards and install them.