Bad situation to be in, but all is not lost.
Most hydraulic systems (maybe all of them?) have a bypass process to retrieve your levelers. On my "non- FR" Class C, I can go to the pump, disconnect the electrical connection and raise the leg by turning the specific valve.
Depending on which brand of leveler you have, it ought to be similar. If you know who makes it I'll check for instructions for you....
Darren, Donna & The Wieners