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PXI Chasis is whistling

An older 6-slot PXI Chassis (NI PXI-1036DC) that we have just started making a whistling sound.  Is the fan going bad?  Any ideas?

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Is the whistling affected by turning the fan switch from auto to high?

RF R&D
National Instruments
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Yes, it does appear that the sound is the fan.  I am looking into replacement options...

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