Mickey D Williamsburg , MI February 10, 2020 Appliance: Model PRG486GLUS Thermador range conversion Needed some parts to complete a Nat Gas to Propane conversion on an older Thermador range. Known issue with frozen bosch venturi tubes. Had to cut out the old ones and replace the orifice holders, venturi and the tubes that I messed up. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours