Hydraulic and gears? I am confused, do you have hydraulic or electric landing gear?
I suspect it is electric, with a single motor and a tie bar to the curb side leg. If so, it is fairly simple fix. Support the front of the trailer, either on the truck or with a couple of bottle jacks. Raise the powered leg to your stopping point. En the front compartment and take the shear bolt out of the tie bar and pich it back. Now, manually crank up the curn side leg until it is equal with the street side leg and reattach the tie bar.