Thinking about buying a UPS store

As the title says. I am currently looking at a UPS store for sale. What are some of the skeletons in the closet type things I need to be aware of.

What do you guys perceive as the greatest risk to your business? FedEx, Amazon etc?

Are there any particular UPS Store specific questions I need to ask that only store owners would know about?

Gross sales have grown about 12% average each of the last 3 years and their SDE is about 25%. each of the last 3 years.

I have not submitted a LOI yet but I want to be ready to take a deep dive once I do.

Update: thank you all for your replies. The responses were exactly what I was looking for (the good, bad and ugly) and I have a good idea of what to look for in deciding whether to go farward with this particular store.