Adrian L K Honolulu , HI June 15, 2020 Appliance: Thermador Gas Range PRG366US Thermador Range Prg366us: Burner cap corrosion. How to replace Burner Head W/Cap Assembly. Direct replacement cap from AppliancePartsPros.com 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes