Red horn parts, what now?

Red canary bird with red horn parts — what now? — I've heard about them for a while, but now I also have photos of these birds — and I've also seen them in person. Indeed: light orange-red beak and legs. I thoroughly examined the birds externally and was unable to detect any liver spots or other abnormalities. As far as my colleague — who has the birds in his possession — and I can tell, there is no disease or anything like that present. The bird (male) looks healthy and cheerful and sings well.