Regarding your water system, I had a similar problem in September, 2015. Got to the campground, no water out of kitchen sink or bathroom tub. Bathroom sink worked fine. I could not fix at campground so I took my 2720SL to my local TrailManor dealer. They replaced my kitchen and bathroom tub faucets. A person at the RV place told me that my problem was symptomatic of not being winterized properly. I thought I had done everything correctly, drained the water lines and my unit is garage kept. I thought that sediment had built up in the faucet valves and hardened. To prevent this in the future I purchased a water pressure control valve and a water filter for the water intake port and I am going to pump in some RV antifreeze before winter.
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