I don't remember of ever seeing or hearing of CR having info available showing how the water lines are routed. You could call them and see what they have to say about it.
My guess would be, you will need to drop the membrane down in that area and look for the leak when you have the system pressurized.
You stated in another thread, that it only was wet when the pump was on. If it's not wet when you are hooked to city water, then I would think the leak must be some where between the pump and the tank.
2008 Cruiser CF26RK
2013 Ford Eco-Boost
Heavy duty payload - Max tow