Sweet Gum is Dying?

We always thought our tree had a section that wasn't as green as the rest. Someone said it was chlorosis. We have a limestone rock patio next to it; pH being affected? Also someone said we had borers because of the lines of holes in the bark.

I thought they were from birds. We do not want to lose this tree :-( It has provided so much shade on our deck and many memories for all our family.

By Pamela