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So a blockage/ or switch issue. Would it be easy to open up the boiler and clean it out. Maybe a new gasket set.
You can order all the parts on line and there is a guy in NW9? that does the parts.
Edit - http://www.partsguru.com/user/Gaggia%20Classic%20gasket%20installation.jpg
This shows how to dismantle the boiler and see if there is a blockage.
Edit 2 - http://www.gaggia-parts.co.uk/, thecoffeemachinelondon.co.uk are the two people I have bought parts from.
It is not hard to take apart. Does the pump make a noise still?