i gave up on the Arizona Ash here in dallas years ago...it was always attracting borers, was weak and puny.
look at the bark to see if you have critter problem...you did not say if the pink splotches started on healthy branches, or grew on the deadwood....
2 thoughts. prune the tree agressively for weak branches, removing any of the affected limbs, (and remove cuttings from yard by burning or if in city, bulk pick up to prevent reinfestation)
you may need to send a sample to the local ag extension agent for identification of the pink splotch, which may indicate a specific soil or foliar treatment for the tree against future visitors.
(or do like i did and euthanize the poor thing, get something for that spot that is better adapted)
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