Hello, I have an Eastern Redbud planted in Portland, OR that up until this spring appeared healthy. It was planted in it's current location, on the south side of the property with good sunlight, about 4 years ago. When blooming this year only about the top third of the tree flowered and now only about the top third of the tree has any leaves on it. We had an arborist over to do work on other trees and they were confused about the pattern of apparent death. They could tell us that the tree was stressed out, but without us having done anything different around it they were perplexed as to what exactly was happening. I'm wondering if your service might be able to offer any suggestions as to what may be happening or if it would make sense to do any sort of soil or other testing at this time. I have included a couple of images that will hopefully be helpful. Thank you.