Macbook Pro w/Retina - Horizontal Lines on Entire Display

We have just issued some 15" MacBookPros with Retina Displays to users. They are running Yosemite. Users are complaining about very low contrast horizontal lines that run the entire width of the screen across all windows, including the background desktop image. They don't really impact usability much, but since we paid top dollar for the retina displays I expect better. Lines are there across all resolution settings.These are not glitches like others have reported.
Anybody seen this?
The users are also having random problems with the entire computer locking up when attaching or detaching an external 4K display but that's a different issue.

I'm having this as well.
I got an early 2014 15" Retina MacbookPro that has the exact same thing for the past 2 weeks.
It looks like there's a very faint, low-contrast white/grayish line every 2 pixels on the screen. It's visible everywhere indeed (also in OSX recovery).
I'm running 10.10 as well but I don't think it's actually an OS issue.

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1. This comment applies to malicious software ("malware") that's installed unwittingly by the victim of a network attack. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
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A web operator who tells you that you have a “virus,” or that anything else is wrong with your computer, or that you have won a prize in a contest you never entered, is trying to commit a crime with you as the victim. (Some reputable websites did legitimately warn users who were infected with the "DNSChanger" malware. That exception to this rule no longer applies.)
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... Some sites like eBay have a Buyer Protection Plan.
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HT201177 MY MACBOOK PRO IS SHOWN GREEN LINE IN THE CENTER OF THE SCREEN

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Macbook Pro w/Retina - Horizontal Lines on Entire Display

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