Yes, I think you should definitely open it up. We do have a [guide|9763|guide]on how to upgrade the display, but it should get you to that flex image cable.
Once you get to it, unplug it at both ends, take a good look at it (make sure there is no physical damage), clean the contacts and reconnect it.
You could also tinker with the Windows Display Color Calibration utility, turn the blue levels down and see if anything changes.
If reinserting the cable and reconfiguring the display does not yield any positive result, you should replace the flex cable.