Frank L Albequerquie , NM December 23, 2016 Appliance: Model I FOUND THE MODEL AND SERIAL NUMBER UNDER IT. I broke one of the knobs on our flat cooktop because i forgot to push it down before turning it I found the model and serial number. I called Appliance Pros and using this information, they sent me and exact replacement. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes