CONCERN: Customer reports R/F Cooktop burner is not working. DIAGNOSTIC AND CAUSE: Inspect wall output voltage for 240 volts, voltage is normal. Inspected supply line and terminal block for failures, supply line and terminal block are normal. Inspected input voltage to the control board, voltage is normal. Inspected control board output voltage to the infinite switch, output voltage to the infinite switch is normal. inspected output voltage from infinite switch to the L/F burner. No voltage coming out of the R/F infinite switch. Found R/F infinite switch failed. CORRECTION: Replaced R/F infinite switch and tested. Operation is now normal. CONCERN: customer disassembled oven door and unable to put back together. CORRECTION: reassembly oven door