We selected the four worst rectangles to remove and replace.
(Sorry, no "before" pics). They ranged from 4"-6" in depth,
so it wasn't going to be easy.
Look how smooth!
My husband rented a jackhammer to
remove / break up the old limestone.
He claimed that part was pretty fun.
Then was the sand underneath and the wooden outline.
Here you can see how nice the new concrete (left)
looks next to the old limestone.
Fortunately, none of the four new concrete sections were side by side.
One repair completely done,
397 to go.