Now that my ML is about 2 years old (its white with 17k mi) I've noticed that the bumbers, side mirrors and gas filler cover are not the same color as the body. The color is slightly more yellow than the bright white of the body panels.

Has anyone else experienced this and what did the dealer do? Is the fix worse than the problem? It's probably not a sun issue since the car is garaged at home and work and I wash it regularly.