Hi, eas pump is operating too often methinks, every 10 secs or so. The car does not sink overnight,or at all,in fact. So I assume the reservoir must be leaking and needing constant top ups?. I was going to do leak tests with soapy water.....but I don't know where the receiver is or looks like! Can anyone point me in the right direction?

Offside chassis rail about half way along, check for exhaust pipe leaks that may have melted the plastic air line to the tank. Could also be a leaky diaphragm, remove the exhaust filter from the valve block and check for air coming out. Could also just e the pump is clapped out.

check the relays as well they can burn inside and cause all sorts of funny issues