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In addition to the check valve, I suspect the float switch. Might be worth checking if there is anything preventing the float from moving freely or if you can replace the switch without replacing the whole pump.
As far as spewing sewage, do you have a ball valve above the check valve? If so close it before trying to loosen the hose clamp. If not, curse the idiot who installed it for not installing a ball valve above it. In this case, you might try loosening the lower side of the check valve first. Be sure to install a ball valve above the check valve when you replace it.
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