Terry, I was out of town on business and my pressure regulator went out. My wife called a plumber and he replaced it. Didn't have any problems until the temp changed and it got hotter outside. Now when ever you turn on the water it humms and drives me crazy. It goes away if another facet is turned on. I'm thinking the regulator is bad or going bad. Do you agree? I have no problem changing it out if it is.