Kitchen Aid Dishwasher Upper Rack

I have a Kitchen Aid Model KUDR01TJBT0 serial # FK4703413 dishwasher. The adjuster on the left side of my upper dishrack broke. It seems the retainer came free from the housing on the other side and in the process blew out the hole it goes in. How difficult is this to replace and how do i get the rack out to work on it?