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Good afternoon my name is James.
Is the blue line going left/right or up/down, and are you able to attach a picture of the screen showing the line?
This is a damaged screen you have a parcel crack within the screen which is causing the issue, there isnt any repair option other than a replacement screen.
A replacement screen is rather involved and takes approx an hour to strip the old one out feed the new cables back in and secure the new screen in place. The cost of a screen is often more than a second hand replacement so you may wish to considering not repairing it.
Please let me know if there is anything further you require.
This would most likely be unsuccessful as cracked screens would often be seen as 'accidental damage'.
However it can only be proven if the screen had been twisted and cracked by stripping down the display bezel, and that act would void the warranty and often puts a lot of pressure on the screen anyway from my experience.
Did you take out extended or additional warranty out or just the standard shipping\1 year return to base warranty?