名媛直播

hi there i have an arakawa sho bonsai that recently started to turn yellow on a branch - was wondering if you have some thoughts on what might be causing it.

much appreciated

here’s a few images showing the yellowing and the location on the tree

Doesn't look good.
Maybe the whole branch died for some reason, did you check if it was something mechanical (like a broken part of the branch) ?
Did you check for insects/fungus?
Can you post a picture of this particular branch close up?