On my '05 Meridian 36G the HWH system pump, shuttle valve and reservoir are under the entry steps. Feel under the lip of the 2nd and 3rd steps. There is a nut there (1/2" I believe). Take the nuts off and the step lifts up. They are hinged on the back.
Check here for loose wires. I just ordered pump and shuttle valve. Sit down. The shuttle was $56 and the pump was $884.00. I didn't need the pump so got mst of my money back for it. HWH will NOT sell to you, you have o go thru a dealer.
There is only one pump for both the slider and levelers.