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The color change is not happening while molting or over the course of several molts. The feathers were a dark brown at the beginning of the year and are now a lighter brown. Same feather - different color. That is completely different from new feathers coming in white.

OP stated the feathers have gotten lighter over the past year, that's different from feathers growing out white after a molt.

Could be fading from the sun. Do the feathers still look shiny and healthy? If so, I wouldn't worry. Wait until they molt and see if the new feathers come in as dark brown again.