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Hmm my vacuum line is unplugged. I haven't noticed any noise but I'm an N52.
When I turn my car off, sometimes the speakers will make a high pitched whine noise. It sounds like something is charging up, then shuts off.
I haven't really looked into the problem but I think it's related to my blackberry stereo gateway. It's always plugged into the cigg lighter for power and that's a very noisy source.
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