landing gear suddenly doing nothing...

Took my 5th wheel back to storage lot yesterday and everything seemed to be fine. Let down the landing gear and rear stabilizers, chocked the wheels, the unhitched just fine. But when I went back to the trailer to lower the landing gear a bit more, nothing..

Extend, raise, nothing. Not a sound or movement. The switch is up front of course and not really sure what to check as this is my first problem encountered.

Trying to find something online resulted in NADA.

Anyone point me in the right (or some) direction?