Is this Siberian elm tree really okay?

Back in July, a City of Ottawa Forestry inspector came at my request and checked out the Siberian elms next to our house. I was particularly concerned about this one because it had a big brown streak on the trunk and the leaves did not seem to be doing well. 

The inspector assured me that both elms looked great to him and were doing fine.

But yesterday, we got an indication that this Siberian elm is not happy. It is definitely more threatening if you ask me.