Jason S Cupertino , CA November 18, 2014 Appliance: Jenn-Air Electric Cooktop JEC8430ADB Jenn-Air Cooktop Jec8430adb: One surface element and part of the top glass are broken. How to replace Glass Main Top. First, I just unscrewed all nuts that are holding the frame and all surface elements. Once all parts, surface elements, control switches, are loose from the original glass, I just moved all parts to the new glass. Due to the weight of the glass, all actions have to be done carefully as I broken one corner of the glass couple of years ago when I replaced one of the control switch. 34 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours