bummer on the stuck levelor!
The powergear system used in these is pretty simple, a hydraulic pump, 3 pressure valves (front, left rear, right rear) and one dump valve.
This is a one way system, it pumps the jacks down, but simply releases pressure and lets the springs pull them back up.
If the other 3 jacks retract, then you are simply dealing with a mechanical problem with that one, it's physically sticky. the front jacks are paired, so just find a way to get under it and force it up. As the left goes up the right will come down a bit.
Hopefully once you get her excercised a bit she'll behave.
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