Ah well that explains it - definitely worth trying to save it. We are at 1000 feet here which is really above the altitude for apples, so all of ours are stressed and tend to get canker and so on - terribly difficult to get rid of but by judicious pruning you can often keep them going. I'll let you get back to the wine
If my ramblings are still not clear tomorrow I will try to explain better.
hahahha, we are about 10 feet above sea level here. apples love it! but this one was smothered by a cedar, ivy, llailandi and a massive hazel bush thing. all of which have been killed or savaged. so glad you think it has hope!