Gary W Lagrange , GA January 22, 2018 Appliance: McCulloch Lawn Mower 400090F Mcculloch Walk Behind Lawn Mower 400090F: Main computer board. How to replace Sahara Control (Electronic Control Board). I replaced the part myself. Part was shipped overnight as promised. Great customer support. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes