We have the predecessor to your RV model. The hydraulic pump and reservoir are under the middle front step. there is one bolt that holds the step in place, remove the nut and you can lift the step.
Totally separate operation from your engine. Your slides are electric, the levelers are hydraulic.
Normal operation is for jacks to retract, and once fully retracted the alarm shuts off (if fluid level is sufficient, and sensor is working). If the alarm turns off, chances are the pump is done pumping the fluid back to the reservoir.
I suspect you are hearing something else as you drive down the road??
Like your name, my third grade teacher kept spelling my name like that (my dad always said that is wrong, but never did any good :-) ) proper way Rambow, too bad we don't get money for the movies!
We are nearing the 6 year point of living in our 39n model, a great coach.
2010 Journey 39n - 2017 Jeep Cherokee Trailhawk - in our 10th year living aboard, now in Arizona waiting for the virus to pass by!