CSX YN2 color fade ideas?

I'm working on a "lightly" weathered CSX YN2 C40-8. Most (if not all) of CSX's conventional Dash 8s that are still left in YN2 paint have all but faded into a near baby blue and bleached yellow appearance. The program I'm using has a tool that can brighten and darken colors, the only downside being it ends up killing texture quality. So if any of our experts out there have done weathering/fading, what would you recommend doing? Should I spray a white color over the yellow and a bright blue over all of the blue, or should I do something completely different? Any and all ideas are welcome
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