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Don't sweat it. Given that the unit is 80s technology I doubt we will find anything particularly exotic inside that can't be replaced. I did a bit more searching but didn't find a picture of the gizzards.
My guess is that a relay has failed as it is an actual moving part and they fail.
Get the lid of it when you get it and see if you can see any relays. They could even be tradional fat ones with a clear casing. Even if the exact unit isn't available it is such a simple task a suitable replacement should be easy to find. Take some pictures and I will try to identify where the relays are.
I found a few references to people changing relays in the ST-4 but they are old APML posts and didn't elaborate.
Hear from you soon
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