Adrienne L Calumet City , IL April 05, 2016 Appliance: Whirlpool 30" Electric Built-In Tap Touch Cooktop GJC3055RB04 Whirlpool Cooktop Gjc3055rb04: Cooktop glass cracked. How to replace Cooktop. I searched online for the replacement glass. When I found the best deal (Appliance Parts Pros) I ordered it immediately. In the meantime I searched on how to install the glass myself. I installed the glass with no problem. Looks like I now have a brand new cook top, saved myself about $400 Thanks Appliance Parts Pros. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes