Can I save my ailing Cherry Laurel bush??

1

I have 8 beautiful cherry laurel bushes and on of them appears to be dying.
Have not been able to see any insect infestation that might be the cause.
Leaves on affected branches have been drying turning yellow and withering. I have removed several dead branches, but the problem appears to be spreading.

I didn't find the right solution from the Internet.

References https://garden.org/thread/view/71458/Can...

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