Timothy D Houston , TX June 18, 2023 Appliance: General Electric General Electric PP989DN3BB Ge Cooktop Pp989dn3bb / : The stem on fan switch broke. How to replace Selector Knob. Watched a youtube video on how to remove the glass top and then it was straight forward to remove the damaged switch and replace with the new one. Project took about 2 hours. Do-It-Yourself Rating: Repair Time Estimate: 2+ hours