Bonsai red under bark, what does this mean?

Question

I did a scratch test on my Juniper bonsai, and all under the bark is red. What does this mean?

The leaves on the bonsai in some parts are also starting to yellow/brown, what should I do?

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Answer 1

This is the natural color of this bark. The needles appear to be a normal shedding process; from the inside of the branch.
https://www.gardeningknowhow.com/houseplants/bonsai/first-bonsai.htm