With the manual system (four toggle switches, one for each corner, plus a master on/off) rather than the later, single button automatic system, once you have leveled, turn the master switch to off. If you still have a leak that causes the coach to become unlevel, you can try to find the leak by using soapy water to soak all of the connections between the leveling valves and the air bags until you find one (or more) that bubble.
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Hopefully this helps.
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