If I'm understanding you correctly, your slides are closed and the reservoir is 1/3 full. If that is the case, you have a leak somewhere in the system. The reservoir should be about 2/3-3/4 full when closed and about 1/3 full when open. Leaks can generate in a lot of different places, but the most common are the lines/hoses and hydraulic cylinder seals. Pretty much everything on the system is re-buildable (except the lines, they need to be replaced). A typical place to start looking for parts is with Lippert, they manufacturer the majority of the RV systems. Another good place to look local would be with a farm supply.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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