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This disease has probably infected your other tree and killed it. Many diseases that infect one stonecrop (like cherries) will infect all trees within the genus. This disease needs to be treated, or it becomes a problem for all related trees in the area. Unfortunately, your photos did not come through, so I am unable to make a further diagnosis.

Usually, container trees are killed by overwatering. It is important to monitor soil moisture. This article will help:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

This article will hlep you to know some of the diseases of cherry trees and their cures:

https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-diseases.htm

Unfortunately, sounds like bacterial canker has caused slime flux. This can be treated, but it will be only a treatment. As of now, there is no cure. Here is an article that will help:

https://www.gardeningknowhow.com/edible/fruits/cherry/bacterial-canker-on-cherries.htm

There are quite a few pests that will cause this. A broad spectrum insecticide should take care of the issue. Here are some articles that will help:

https://www.gardeningknowhow.com/plant-problems/pests/insects/skeletonized-plant-leaves.htm

https://www.gardeningknowhow.com/plant-problems/pests/pesticides

Unfortunately, we do not offer information on specific places to purchase. I would try your local nurseries, or online!

Maybe an infestation by black cherry aphids? Usually happens in the spring and may not cause problems (other than distorted leaves) in mature trees.

Leaves wouldn't be brown unless the branches are broken or there is root damage. Here is what to do:

https://www.gardeningknowhow.com/ornamental/trees/tgen/what-to-do-for-storm-damage-trees-repair.htm