I recently had a repair just like this and I would like to modify my original post. I do appreciate all agreements.
First I checked the master valve and replaced the diaphragm. Then I went to each of the problem zones 1 and 2, and replaced the diaphragms in those two valves as well. This did the trick. I could not have done it with out the Valve locator.
It took some time to develop the strategy.
I hope this helps somebody.