There is a 1/2" threaded nylon/plastic plug near the bottom of your water heater. You can remove it easily with a 3/4" deep socket. Open the pressure valve and the tank will drain quickly after removal of the plug.
Based on my similar experience with bedroom slide creep (and multiple discussions with HWH) the most frequent cause is a leaking extend solenoid for that slide. You could also have a leaking hose or slide ram but the extend solenoid is the more likely culprit, especially if it creeps out fairly quickly after you retract it.
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2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA
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