Philp G Kingsville , MO September 03, 2016 Appliance: Model APL985UC The center burner on my bosch cooktop would not stay on after the know was released I called app and explained the problem and the person I talked to asked a tech advisor there what the fix would be. He said the valve needed to be changed. I purchased the valve and it arrived in 2 days. It took me about 45 min. to remove the cooktop, change the valve and replace the cooktop. Read More... 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes Tools: Adjustable Wrench, Pliers, Screwdrivers