Carlos C Peachtree Corners , GA August 25, 2015 Appliance: Whirlpool Undercounter Dishwasher GU2400XTPS7 Whirlpool Dishwasher Gu2400xtps7: Broken ears on upper dishrack wheel. How to replace Dishwasher Upper Rack Wheel Assembly. Easy as remove it from the rack and put the new one in place. No tool been used. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes