How to get at water pump in a Jayco Granite Ridge 3100ss.

This is the second post today with a 31' MH looking for the water pump.
I believe your floorplan is similar to our Winnie., with our water tank and pump under the rear bed.

I had to lift the mattress off the platform....then remove the plywood at the rear of the hinge.

Here is what you will see.....at least in my RV.



I'm thinking of cutting out and installing an access door on the back of the MH, so that it's easier to access this stuff.:)