I have a Zoeller M53. Twice in the last month it has stuck in the float up position, so the pump keeps running. I think that is a good thing as I would hate for the pump to not kick on, my sump pit would be full and overfilling in 20 minutes if I didn't have my Liberty water powered backup. Should I be looking to replace the whole unit or replace just the switch? $170 versus switch $35 Leaning toward switch and gasket. What do you guys do?