Rear fan making noise - is it fixable?

Greetings, the lower rear fan of my Mac Pro is making noise - a faint grinding noise - as if the motor has sand inside. Since I bought my Mac Pro at an Apple Store, can the tech guys fix it? Or can I fix it? Or is it even worth fixing?

The lower rear I believe is an exhaust fan to dump the heat inside.  It can be replaced.  Not sure how difficult that particular fan is.  You could add one of the temperature monitor utilities (iStat Pro, iStat Menus, Temperature Monitor, Hardware Monitor) and keep an eye on some of your temperatures if you can live with the sound.  It may get worse or may not.  No way of knowing if or when it would fail, or if it will fail at all.

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