Popping Sound from 2000 C5

Hi Everybody,

I hear a popping sound from my C5 as the car rolls slowly backwards or
forwards. The popping happens whether the car is in gear or not, or whether
the brakes are on or not. It seems to be coming from the rear of the car. At
first I thought there might be something caught on a wheel, or a nail in a
tire, but there isn't. The sound has no rhythm and occurs randomly. I can't
seem to hear it while driving above a few miles an hour - even in a parking
garage where it is easy to hear sounds bouncing off the walls.

From what little I have been able to find via Google, it sounds like it might
be a problem with a bearing. Any thoughts?

Thanks,
Matt

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