[petervandijk]

Hello Fred, I have been replacing the dump valves recently on my 2007 coach. The sensor is glued to the valves. You can find them on the passenger side bay. They are the black valves in the dump pipes. The sensor is glued on the side of these valves. Check on the 2 wires if they are still connected and if the sensor ( reed contact ) is still glued on. If You want to check the sensor, measure the resistance when the valve is open. Should be almost zero ohm. If You want to check the led light, just bridge the two wires coming from the sensor and led should come on. The valves in my coach are located in the bay where the Aquahot is installed.
I have pictures, but don't know how to add.