Valhalla360, The water on the floor was coming from the Antifreeez line Cavie mentioned. This was due to me having the 3-Way valve in the wrong position.
I need to take the cabinet apart again. I should have snapped a photo of the pump label while I was in there yesterday. If it is indeed a diaphram pump, I will start looking for a rotary pump. There is no reason to have to listen to that noise in anything that cost as much as this. I could very well be wrong again, but I can't imagine sitting in a Prevost and having to endure this noise. Not to mention the cavitation of the water pressure!