I would not agree with your mechanic's assessment. If the water pump is giving signs, listen to them and change it. There are a lot of Boxster owners changing their pumps pre-emptively every 4 or 5 years to avoid the potential damage resulting from a failure, as it is a known issue with these cars.
There has been quite a bit posted on this topic in the forum. I would suggest you do a search and read up on the issue. It could save your engine.
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'99 black 986
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