Congrats and welcome to the site.
Do you know where the pump is? (Run it and listen)
Typically Thor will staple all the panels in except the ones they expect you to remove--look for screws. If a panel is screwed in then it is removable (usually only 2 screws).
Looking at your floorplan I'm not sure where the pump is--it usually is near the water tank. Looks like the water heater is under the dinette, lift up the cushion to see if the pump is there.
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