Left side of display dim

I have had an intermittent problem with the left side of the display going dim. The first time, a couple of years ago, Apple fixed it. The next time the people at the store couldn't see the problem (it does appear to be intermittent -- it was okay for a while, but dimmed again a week or so ago). Their solution is to crank it up to the max brightness. This is not a solution, as it's markedly dimmer at 6 notches than it used to be, so something is wrong. The warranty is about to run out, so I have to call Apple Care tonight or tomorrow to see what they say. (The store claimed they put a note on my file just in case it happened again post-warranty, but I am not trusting to that since it took two hours to find a record of the first repair.) Any suggestions as to what the problem might be so I can sound intelligent and not like the nutcase they seem to think I am for "imagining" a dimmed display? (The last time, I almost cried because it was so frustrating!)

There -probably- is some controller board or other component failure
occurring in the computer; so AppleCare should be able to find a
cause behind the dimming of the display, in such a fashion; if a
tech gets some time with the actual machine to test it properly.
You may wish to make a backup of your stuff just in case the
system or something else changes while your computer is away.
If you have and use an externally enclosed hard disk drive and
make a backup (boot-tested) clone, you'd have all bases covered.
And if not, maybe save your stuff to some off-computer media.
Good luck & happy computing!
PS: Do you have a digital camera and can you take a good
enough image capture of the screen with that, to see it dim?
edited.

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