can not find technical drawing and instructions to clearly define uninstalling and reinstalling the ignitor in lower oven. Can not get to screw or fastener that attaches ignitor to gas tube and also can not get to electrical contacts to remove ignitor. I aso can not get the gas flow tube out of lower attachment to make it easier to remove the ignitor. Is there a instruction manual that spells this procedure out for a do-it yourselfer? .. Gary Carter owner