No, I do not usually recommend an expert for a sprinkler system. I'll try to find the shutoffs, and make sure the water is on to the system. I'll check to see if there are heads on a wet system in an area that might freeze(that's bad). In commercial, industrial, and large multi-family buildings, they'll be required to actively test the system regularly. That assumes, of course, that the AHJ is paying attention. Single family, and small multi-family, systems that run on basic residential water service, are generally not policed. That's the stuff you see tapped off the regular water service entrance.