Red vertical line on left side of iPhone4 screen.

I have a thin, red vertical line on the left side of my iPhone screen that appears on a black or dark background.  Anyone know what causes this and should I send my phone in for repair?  I've had this phone for about 3 months.  Thanks!

Hi Brent,
I took it to apple service center. They did some checks and found out that the display has gone bad and they replced it with new one.
Did you try connecting other display (may be Apple Display or Dell monitor) using an adapter?  In my case the Apple service center people tried doing it and the display was appearing just fine without any green line. So the fault was in my MBP display.

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