To get to the pump you have to take the lid off, it slides backwards, then the left side panel, looking from the front, and then push in 2 clips on the inside of the back panel. You'll see the clips once you have the covers off.
I needed to do this today as water is not getting to the top tank. Looks like the pump has packed in so chances are I'll through the thing away. I had complaints from my neighbours about the noise it makes. Wouldn't mind but they live 3 miles away !!!
Tony
March 2009