My ~2 Hz thrum (only noticeable at idle) was diagnosed by the tech as a faulty tensioner pulley. It's supposed to get changed out this week, so we'll see!
As far as what tool to use for relieving the tension when changing the belt, I used an 18" breaker bar with a 24mm socket (1/2" drive). Worked great
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2001 Boxster, 5 spd, Seal Grey
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