Is our 50ish year old Japanese Maple dying?

[burnbug]

This tree is probably around 50 years old. Largest Japanese Maple Ive ever seen. Recently noticed tree limbs dying and a concerning ooze that looks like melted milk chocolate. Behind thr ooze, the wood is very soft. I can poke holes into it with a twig.

Is it infected? Saveable?
Seeing other limbs with splits forming.

 

[hickoryhoarder]

Japanese maples don't always live more than 40 or 50 years. And droughts in my area have taken many in the last ten years. They do not seem drought resistant.