Dang Sprinklers

We keep having problem after problem with our sprinkler system. It seems that every weekend another piece breaks or springs a leak or stops working completely. It's a conspiracy to keep Hubby busy over the weekend I think. Today he fixed a few pinhole leaks in one pipe and as soon as that was done a huge leak started coming out from a pipe somewhere under the sidewalk. So Hubby is trying to figure out a way to find that leak without having to completely dig up the yard. Hopefully it won't take him too long to find and fix. I know he's tired of spending his Saturdays fixing the pipes.