We finally realized what is wrong with our sunburst locust tree, it has a bad crack which is making a large portion of the tree die off. We are going to prune out the failing branches to see if we can save the healthy portion of the tree. We will trim back the healthy branches to hopefully eliminate more breakage from wind. This tree takes pruning well as we have pruned it many times with no problems.
Our weeping walker Siberian pea tree is dead and will be remove, unsure if we will find a replacement or plant something else in it's place.