A couple of years ago I had a massive water pump failure which resulted in a fairly extensive coolant system rebuild at my local Porsche dealer. A few weeks back when I was driving to have my car serviced, I had pink spray from my rear passenger wheel arch...after checking I found I lost almost 2 gallons of coolant. In this instance, it was my tank cap.
Point is, several things can happen to coolant system. Best thing is to have it tested under pressure.
Personally, I like my dealer (fair, prices are in line with independent shops and I would hope has more experience than some others); I would suggest if you have a good relationship with your Porsche tech, go there...if there is an independent in your area that has experience with 986's, go there. I would disagree that dealerships are "super expensive", I think that's more on a case by case basis.
Anyway, best wishes, and happy driving (soon)!
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