DK about this particular boat, but I've found them behind the galley fridge, inside caninettes, and just about every place else you can imagine. In the engine room is a pleasant surprise when it happens. Start at the water tank and follow the line from there. It's often behind a hatch, inside a cabinette.
Very easy. Turn on pump and follow the sound. You can always hear them. Every carver I've owned has had the water pump in the engine room though. 95 % chance it is there.