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Bearing Noise
Q1 - Bearing noise at slows speed can be a clicking noise, particularly when turning. It's often a hum at higher speeds. It really depends on how badly worn it is. If you jack the wheel up to may be able to feel a very slight amount of play or if you rotate the wheel it may not feel perfectly smooth. You can always jack up the entire back end so you can compare both sides.
Q2 - Most dealers have a special tool to replace the bearing while the hub is still mounted. I've never done a Boxster, but think they can remove the axle without removing many components and altering alignment. Best best is to verify with the dealer rather than rely on the board.
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