Ok well the other day i ran over a sprinkler head.....this hasnt happened in over 15years!!!! After hitting the head we stopped and looked for more heads that were up. Stepped/ popped down over 7 heads. We ran the system and soe of the the sprinklers go down manually instead of auto. I guess she just had the sprinkler guys out! So i dont have to fix it. But im just curious why this is.... I pulled some of the grass back and they still dont go down..... Why is this??