On the LCI system, you can retract the jacks by using a battery operated drill with a 1/2 socket attached and a 5/32 hex wrench (the L shaped tool that comes in a set). Go to your LCI manual and reference the section on manually retracting each jack.
In a nutshell, you have to pull the power lead on the solenoid, turn each individual jack valve clockwise with the 5/32 hex tool, using the handheld drill with 1/2 socket in reverse to power up the jack (uncover the attach point on the end of the pump, usually covered up with a round plastic or rubber cover). Then, you close the valve by moving it counter-clockwise, then repeat for the other jacks. The front two valves facing you are probably for the front jacks, the rear valves are for the rear jacks (and somewhat difficult to access).
Once you learn how to do this, you will be much more confident the next time your jacks fail in the down position! I have had to do this two times so far.
Art & Sheila Mullis with "Cam" the Kitty
Driving 2016 Winnebago Adventurer 37F
Towing 2018 Ford Explorer 4x4 Platinum