The pump manifold has a solenoid that releases the hydraulic fluid / pressure on the return side of the actuators. You can turn the small screw on the back of it to release the pressure manually (no more than four turns, other wise you'll damage it). At this point you'll have to use a floor jack to force the jacks up. And brute force the slide in. As a second option you can disconnect the hydraulic line and let fluid release, hopefully in a bucket. Not great options, but two way hydraulic cylinders require fluid movement to move the piston. In on one side, out on the other. Good luck.
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