Access to freshwater pump on 2005 Nuevo ES

My freshwater pump is located between the offside wheel arch and the gas locker, tight up against the wall. It seems to be in a very inaccessible place. Has anyone had to replace the pump and how did you do it? I am getting air in the water supply to the taps and suspect a leak on the inlet side of the pump or water pipes. The screw on filter seems to have a bit of polystyrene in it and I would like to take the filter off to clean it and check for leaks. I am wary of disturbing the pump and plumbing as it seems so difficult to access it to remove it.
Any suggestions ?

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