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Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
What you can try to do is open the solenoid valves for the jacks and then see if the jack will start to creep up and then you can try prying it up with something like a 2x4 once the jack is up shut the solenoids.
The pump is mounted between the forward frame rail extensions just behind the front grille and bumper area. The valves can be reached best by lying on your back and reaching up between the mounting brackets. The hydraulic pump is equipped with two types of hydraulic solenoid valves shown. The leveling jack solenoids have a T-handle on the valve shaft that can be turned by hand. The slideout room solenoid has a small 1/4” nut at the end of the valve shaft that requires you to use a 1/4” nut driver.
Open the T handle valves about 5 turns the jack should start to creep up.
Robert
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Ellen
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