Slight buzzing noise on 13" MBA 2012

Hi,
There are three 2012 MBAs in my family.  Two of them are completely silent.  The newest one (i7/8gb/256) has a faint buzzing noise that is audible in a quiet room.  I figured that it was a bad fan, so I brought it in and had the geniuses replace the fan.  With the new fan, it is making the exact same noise that it was making with the old fan.  I've had it less than 14 days, so I could return it.  But this is my fourth one and the first one with a screen that was good.  So given my luck, I don't want to exchange again.
Are there any parts in the computer that could make noise, besides the fan?  I'd think that it was normal, if we didn't have two other MBAs with no buzzing noise.
Thanks

"Any thoughts?"
Call AppleCare.
Jim
PowerBook G3 500 Mhz "Pismo"/ 2.0Ghz BlackBook 2GB OWC RAM   Mac OS X (10.4.9)  

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