Sounds as if you’ve got the common bus-breaker issue. Many of us have had it. Follow these instructions, and you can save yourself about $150 on having a tech do it:
Open your generator compartment and find the breaker bank for your leveling system. On my rig, the breaker bank is located high on the left side of the rear bulkhead.
There are multiple breakers in the bank, but you're looking for the one with the heavy-gauge red wire from the hydraulic pump.
On mine, this wire is the one in the center that has a blue crimp connector on it.
They say these breakers are supposed to have reset buttons on them... but mine did not. Remove the nuts, and replace the breaker with a new 50-amp one that you can get from almost any auto parts store for about $3.00. Simple repair, just remember the gold post goes on the bus side, and the silver post goes to the wire.