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It seems my 41A power 8 system has developed a very high pitched
whistle/whine in one of the power supply fans.

A few weeks ago I took them both out (very nicely designed for easy
removal!) and cleaned them out with a little compressed air. Seemed to fix
it.

But, now after a couple weeks it's back.

Is this common? Is there anything I can do to lubricate them and stop the
whining?

And when I removed the fans before I shut down the entire machine and
pulled them both out. But, it looks like I can pull one out at a time
while the system is running... Is that the case?

Thanks!

Bradley V. Stone
www.bvstools.com
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