Diagnose this cherry disease? Root rot?

On one of my cherry trees originally planted wrong (unamended clay soil/wet feet) I have seen it have a disorder of fresh leaves each year. It affects the entire tree. It stays alive but barely.

I assume this is probably some sort of root disease. Does anyone know what this is? Rootstock = Colt. I am removing the tree today. Just curious, not going to save the tree.

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