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Retaining wall repair.

I have two retaining walls that need attention. Please quote for both separately. The first is on the right side of the property and is showing signs of starting to lean. I understand it has not been done with the correct support poles. Is there any way this can be repaired, or will it need completely redoing, or is it fine for many years to come? The second is to the left of the property behind the garage. It and the fence are leaning and need attention. Please quote for this repair. Many thanks.