Random sound/noise coming from bottom left of thunderbolt display?

Hey everyone,
I bought my Thunderbolt display in September 2012 and it worked well until a month ago. The screen started turning off, and USB and Ethernport ports would stop working from time to time. I took it into Apple and they gave me a new display after being unable to fix the problem.
But now I have a new issue. There is a sound that comes from the display at random times. It sounds close to, but not exactly, like the sound a Mac makes when moving an item to the trash can. It appears to be comming from the bottom left side of the display.
I've tried raising and lowering the volume, but that didn't have any effect (sounds the same no mater where the volume is). Even when the display volume is muted, or even sound output is sent to my USB DAC, the display still makes this noise. It can happen once every 30 seconds, or once every 30 minutes. There's no consistancy as to when it ocures.
I tried connecting my Fiance's MacBook air to my display thinking it may be my Macbook Pro, but the noise still occured.
I've tried connecting the display power to different outlets and different surge protectors, including a Sine Wave UPS, but neither helped.
This has been an issue with 2 brand new displays Apple gave me. I'm still using the second display but getting ready to return it for a third. But before I do, I wanted to post a question to see if someone had any other idea on what it could be and to see if this is something I could fix myself.
It appears to be hardware related, and from my testing it seems to be an issue with the current new Thunderbolt Displays.
Anyone have any thoughts?

I have a similar issue. Both output and input sounds are setup to come out of a USB speaker system I have attched to the display USB ports. However when emptying the trash, the sound Macs make when doing so comes out of the display speakers. No options for that sound are available. Very odd. There does not seem to be a relation between the volume control either and the volume of the display, the display is loud, even when my mac system voulme is low.

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