I have an 06 Beaver Marquis and having a problem with Multiplex. I thought it was the switch plate in the gally with 10 switches. Aqua Hot button would not work. Then i noticed the water pump button had a problem also. This am I turned everything off, batteries and shore power and inverter was off. When turned back on everything came on water pump turned on and aqua hot also, but after a few seconds the aqua hot light went out and it would not come back on. It ran its normal tiime and turned off, but you get nothing after that. The water pump basically the same way comes on and goes off. Tried all diffrent switches for water pump inside coach all same. Turn on outside and it works fine. All help appreciated. Love the Forum.