Catsaplenty,
The Floorplan in the rear looks exactly like my 2551. I have marked in red where you say it leaked. Presuming the plumbing, etc. is just like my 2551,that is where the water pump is located. To get to it, you remove the mattress and you will see the plywood underneath is held down bt about 20 or so screws. Remove all those screws and the plywood will lift out. Underneath, where I marked the Floorplan, you will see the water pump and the lines leading into it. Connect to city water and look to see if the leak becomes obvious. It MAY only leak when the incoming water pressure is too high (80 psi or higher) but that can.be corrected by adding a water pressure regulator to the city water hose at the park faucet. They are cheap... under $25.
My guess is that the pump itself has cracked or the output line has worked itself loose. No need for a bigger hammer... Just replace the piece that's actually leaking.
If it's not the pump itself, a camera probe can go underneath the wardrobe from where the pump is.
When your done, put the plywood back, put the screws in the same screw holes and tighten. Put mattress back and you are done.