Lift up the bottom edge of the bed. It is on a piece of plywood. The fresh water tank is under there and the pump is obvious. On mine, the connector had come loose. The warranty mechanic just plugged it back in.
Also check the fuses under the refrigerator. Push in the cover and it pops out. Push it in again to latch it. The bozo mechanic pried ours open and broke the latch!