If you all recall, I had one zone that would not put out enough pressure/volume to pop-up the heads and the water just dribbled from all heads. Finally through in the towel and called a sprinkler repair service. His first comment was that he would have it fixed in about 15 minutes. 2 hours later - after trying new diaphragm, checking for leaks in underground lines, cleaning the antiback flow valve found a partially plugged barb fitting at the valve box. Sure glad I didn't drive myself any more crazy than already am. Well worth $$$ to let someone with experience sort this out.
Thanks for all the suggestions and I did try them all before going to the pros.