On my 2000 Magna there are 3 solenoid valves that are used for fresh water drains. I had one that refused to close after I drained the tanks and repaired the valve. These valves have a rubber diaphragm with a small hole, maybe 1/8", to allow pressure to equalize on both sides of the diaphragm that can plug up with calcium that will keep the valve from securely closing. The calcium deposit was my problem and it was easily removed. I was able to take the valve apart without removing it. If you need information on taking the valve apart, google Red Hat Solenoid Valves. I ordered a rebuild kit but didn't need it. The kits are pricey but the valves are even pricier.
I don't know if that is the cause of your problem; just an idea.
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Pete - Full Timing
2000 Country Coach Magna 40' Indulgence, CAT C10, #5892
2019 Ford Ranger XLT
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