My Sunstar 30T jacks show a jack down any time the coach has set for a few days. It's caused by a leak-down of pressure. If it's only set in a CG for a few days simply hitting retract again may fix it. It's such a common problem that there is an instruction in the manual on how to reset it. Don't have my manual at hand now but you hold "retract" and one other button for several seconds.
Leaks that get to a rail can go a long way. On a Skinnie Winnie View I had the fuel pump filter was not tight and leaked. The pump was in the rear (in a hidden compartment) and the water leaked at the steps near the front. Pulled a lot of panels before I found it.