Last sprinkler in zone has little pressure
The last sprinkler on the final zone of my 1 year old 6 zone sprinkler system is very very weak. It was working earlier in the day and then it wouldn't pop up fully so I unscrewed the rainbird, got the dirt out and put it back in, but now the pressure is weaker than before. Is it possible a rock or debris floated into the flex pipe while I was away? That just doesn't sound right. If there's a leak/crack further up the line I'm not sure how it would happen since there was no digging.
When I turn the zone on without the sprinkler head attached water flows out very slowly and I don't see any puddling before the flex pipe. I tried unscrewing the valves in the control box, but that didn't do anything. The other 3 heads before the last head work perfect. I also can't find any bubbling in the lawn incase there is a leak after the 3rd head. Is there an easy way to blow out any possible debris without the winterizing process?
I know nothing was very clear there, but hopefully someone has come across this. Thanks