Nicholas S Harrington , DE December 28, 2015 Appliance: Whirlpool 30" Electric Ceran Cooktop GJC3054RB05 Whirlpool Cooktop Gjc3054rb05: Broken glass cooktop. How to replace Cooktop. It was as easy as ordering the new top to the glass Cook top and replacing it. The Cook top just rests on top of the counter. So all I had to do was lift the cook top up off of the counter, unscrew 8 screws that secured the glass top to the cook top. Once I removed the broken glass, it was just as easy to reinstall the new glass. Fastened the 8 screws back into place and placed it back where it was in the counter. The end. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes