Yes. Right side in my case:
In my case it happened after a year under warranty. Sent it back and they fixed it in a week. The service ticket had something vague like "XXX bracket came loose, replaced".
If you are out of warranty, it may be worth opening it up to look if you are comfortable with that. Since the rest of the picture was perfect, my guess is that something was blocking part of the light path from one of the three LCDs. You may be able to simply push it out of the way again.