I had the same thing happen with mine, it was not the belt being loose though. I reached out to KRC and they said it sometimes happens. I changed the pressure release valve to a #4 from KRC, not for the squealing, just had read on the forum that it made the power steering better, i.e. less "twitchy" (thanks Paul) on the highway, which I believe it does. A nice side benefit (perhaps) is that the squealing instantly went away. Did nothing else (other than checking the belt which was tight) but that... FWIW.
Ray