Cheryl B Tuscaloosa , AL January 17, 2020 Appliance: Jenn-Air Self Cleaning Slide-In Downdraft Electric Range JES9800BAF Jenn-Air Range Jes9800baf: Broken knob and very greasy grease filter. How to replace Grease Filter. This repair was the most simple one I have ever done. Toss what was left of the broken knob and pop the new one on. Same with the grease filter. Out with the old and in with the new! Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes