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I have worked a lot with these. Resoldering IME is at best a temp fix unless it's truly Resoldering, removal of old solder and put new, not just reflowing.
I have one unit that is this way and works, and another unit that I got the replacement relay and that works also.
There are two similar units, one has a snowflake on the button and one has AC. I don't know if the different buttons sig real differences, I was advised by someone fairly knowledgeable that they *may* work the opposite of each other, not sure though. But if those buttons match the unit matches, so 91-2-3 will have compatible ones. I have all those years myself and they have the same unit, 7 and 9.
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