I was doing a PM recently and I noticed that it's fans has an unusual sound, more like of a "static electrical sound" in its three fans. I'm about to replace the three fans, I do have the part numbers already but my question is, how can this affect the performance of the power module or the UPS itself? Can this possibly shutdown the entire unit? I'm looking for a white paper for the fans but unfortunately there's no record found in the APC site. Your help would be much appreciated. Thank you!
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