I would guess spider mites or thrips as well.
Ask them to check on the undersides of the leaves with a magnifying glass to see if they can find any insects.
You can use a number of methods to remove from high power water mist to wash them off to pyrethrum (sp?) or neem oil base sprays.
I don't usually see wind/sun damage happening to such mature leaves/plants, and it's not hail damage.
Only way I could see it being sun damage is if they sprayed the leaves with something in the middle of the day... ie. sun/magnifying glass effect.
Lee
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