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Am I correct to read that you are getting no lights at all when pushing the black tank button? If you are not getting anything I would suspect a wire has fallen off behind the switch cover or alongside the tank. If it is reading full all the time you may need to flush the inside of the tank a few times to get it to read empty. But I am reading that you are getting no lights at all. So, I would be inclined to think a wire has fallen off somewhere.
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