Harold Y Foxfield , CO December 12, 2015 Appliance: Whirlpool Gas Range SC8900EXQ0 Whirlpool Cooktop Sc8900exq0: Warped burner grates. How to replace Burner Grate. Purchased new replacement burner grates. Removed old grates and replaced them with new Burner Grates from AppliancePartsPros.com. Cook top is as good as new... Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes