Water pump situated ? - Bailey Champagne 2000

by Kharn
(Folkestone , Kent , Britain )

Hi I have a Bailey Champagne 2000 and the water pump or pressure switch has packed up, I know where the switch is but the pump has baffled me to it's where-abouts?

Is it the pump that drops in the aqua roll because if so that works as I tested that on a 12v battery, all current is working so bit baffled !

Any answers would be much appreciated as I'm new to this.
Thanks Kharn