Mine stopped working last fall (came down to a basement with 7 inches of water in it).
I hit the pump with a stick and it started pumping, but after that, I found water filling the french drain until I hit the pump again at which point it pumped again. It sometimes stuck and sometimes worked.
I just decided to be safe and get a new pump, as I have no idea how old the existing pump was (it was in the house when I bought it).
Some pumps you can just get a new float assembly, others you can't replace them.
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