The leaves on my “Lavender Lilac” bush are turning yellow with brown spots, what might be the cause?

Question

I live in zone 7a, the lilac bush is planted in full sun. See attached photos

Answer 1

I don't see any photos but this article tells you how to deal with spots on your lilac leaves.

https://www.gardeningknowhow.com/ornamental/shrubs/lilac/common-lilac-problems.htm