Faint grey line less than 1mm large near center of LCD panel

[IIfx]

Hello Everyone,

Today I noticed a hairline mark in my ThinkPad x230's IPS panel. Its slightly above and to the right of the center of the screen. I have no idea what it is.

Here is a photo of it: (Circled by red box)
http://i.imgur.com/29rSNdC.jpg

The ThinkPad is only 4 months old and has had no problems so far. This mark has suddenly appeared, or I have not noticed it until now. The computer has never been dropped and has always been carried in a padded bag.

I checked that the mark is indeed not dust or a smudge on the outside of the panel - its in the panel.

My concern is that Lenovo will not repair this defect citing customer damage. Is it true that x230 IPS panels made after 11/12 lack the ghosting issue? Mine has ghosting so perhaps I can use that as an excuse to get a replacement panel.

Thanks!