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If this at all a tricky job, I'll hand it off to a garage but if it's simple enough that even a mechanical idiot can do it, I'll give it a go.
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That could be a contradiction in terms bearing in mind they put a new pump on and don't appear to have solved the problem.
Take the moulded trim off, the one that is screwed beneath the bottle and using a torch have a good look to see if there is obviously any crud in there.
You may be able to get the pump off, then use a bottle of clean water "plumb" them together to test the system.