consider core aeration, bigger and deeper cores than for the lawn, then backfill with fluffy compost and deep regular watering at the appropriate season. If'n the owner wants to save it, throw in the official Davey Tree deep root fertigation too if you can sell it. :)
Green lawn usually = frequent shallow irrigation, over time it can lead to a limited tree root system vulnerable to drought stress, heat/cold stress etc.
Consider anthracnose and/or verticillium wilt (not that I am leaning heavily that way)
Any vascular staining?
ID the fruiting bodies? I didnt...
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