I had the same problem with my '07 with less than 30k miles on it, which I think is unacceptable IMO. One side would go dark then come back on intermittently, then it went out and stayed out. I had the whole unit replaced under warranty, but I think it is BS that you should have any interior lights or LED's go out on a car that is only a few years old. I also had the display on my stereo go funky on me and that was also replaced under warranty.
I had the same problem with my first car which was a 1982 Toyota Celica. It ran like a champ but I had all sorts of interior light issues with it. You would think that Toyota would have eliminated the electrical/lighting gremlins in 25 years.