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It sounds like your float switch is going bad. Depending on the age of the pump, you may want to go ahead and install a new one. I'd start by running a bunch of water and letting the pump cycle a couple of times so that when you change out the check valve, the water in the riser is fairly clean. I would install a ballvalve and union on either side of the new check valve to make maintenance/replacement easier in the future.
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