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Maybe you won't see this until morning... Anyhow, I'm not a plumber but the fact your pump is continuing to cycle and you're getting water back in the basin seems to me like it's all related to a failing check valve and I think replacing that is all you need to do.
If your valve is over the pit, just take a length of pipe or something and stick it up the pipe and push against the valve to open it and release that backflow water, then unscrew your valve so you don't get sprayed.
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