My aura one also has the same issue with rainbow colors. The bottom right part has a larger redish color that stands out and is distracting while reading(especially in full screen mode). My screen also has a tiny air bubble/pixel that would light up on dark background.
Contacted kobo support and after sending them the pictures of the device and waiting for 5 days I received an email that they are planning to send a replacement device within 5-7 days (aura one is an expensive device, I would expect a much better support)
Interestingly the top part of the screen is very uniform, no rainbow colors and looks awesome in the night mode. The size of the device is just perfect and I hope that the replacement would not have the same issues.
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