I had this problem on my former DT (bought it 3nd hand, probably first batches). I noticed 1 year after selling it, when I borrowed it for new OS tests. 4 leds. 11, 12, 13, 14.

As @Resist mentioned, it was absolutely obvious in TEST mode (Hold Func while powering on).

In below cases, red instead of purple means lack of blue fir instance.

Track selection, all leds supposed to be white except selected (16).

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