Sprinkler zone not working
I have a 7 zone Rainbird system. Zone 6 stopped working suddenly. (6 & 7 cover my back yard). I manually opened 6 and the sprinkler heads activated but when I tried to manually activate 7 I heard the water at the valve and it began spewing after loosening it enough, but nothing at the sprinkler heads. No air sound, partial activation, nothing. Just dry.
Any suggestions would be greatly appreciated.