I can give you a short list of things to check out on the level sensors to figure out where the problem is. If looking into this level sensor thing, I would push back the RRP install a few days to a week and fill the tank full and then observe the level sensor ohms at each side to see which one or both is not reading full. This could be useful information when in later for the install but the install needs an empty tank so it could not be checked at that time.
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