David; I would like you to perform the test I listed because your evidence doesn't point immediately to a straightforward diagnosis. Your friend should not buy anything yet as there is a risk that he could waste his time and money. The cheapest and most reliable solution is to repair the original fan system. Ebay fans will not be "uprated". If a replacement is proven to be necessary, and we don't know that yet, I'd strongly recommend that you take the advice of club members Arctic and Jules.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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