James W Bronson , MI September 08, 2020 Appliance: Model RKG25H0X ER KITCHEN AID MIXER The speed control was erratic to not working. I took the speed control board off of the mainboard and took it to my shop and cleaned the slider area with contact cleaner and blew it off with compressed air. It works great and the new slider board that I purchased will be used as a spare because this is the most used part on the mixer and it will be a problem at sometime in the future. 8 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes