James B Wesley Chapel , FL December 11, 2016 Appliance: Whirlpool Electric Cooktop GJC3034LB02 Whirlpool Cooktop Gjc3034lb02: Cooktop glass broken. How to replace Gasket, Cooktop (Front & Sides). Removed cooktop from counter, removed screws and pulled off broken glass. Applied foam gasket around new cooktop (purchased separately) and installed new glass. Very easy repair and a perfect fit. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes