Thunderbolt 27' has gray lines across the screen

I have gray horizontal lines every 10 pixels on my Thunderbolt Display 27'. Does anyobody know how to solve it? I have all updates installed, I tried to un-plug/plug-in the display and restart MBP but it didn't help. What's interesting, I do not experience this problem on another display.

Did you ever figure out the cause of this?
I have the same problem when plugging my late 2013 rMBP (running Mavericks) into a Thunderbolt display. Really distracting. I have so far tried: restarting, changing resolution, changing thunderbolt ports - none of these seem to have made a difference. I've used other external monitors connected to the rMBP via HDMI, without this problem.
My next plan is to try with another Thunderbolt display in the Apple store - that should hopefully narrow it down to a display issue vs. graphic output issue.

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