I have a Kitchenaid superba gas range slide in, model #KGST307HBS9. The nob of one burner, only, the left rear, will initiate the electronic spark that will light burners. When that nob is turned to ?lite,? then sparking occurs at all burners. None of the other burners can be lit by turning their nobs to ?lite.? However, two of the burners can be ignited when the left rear burner is turned to ?lite? by turning on the gas, left front and right rear. The sparking of the right front is weak and irregular and does not succeed in igniting its gas. It seems to me that there are two problems. One in the sealed right front burner that produces a weak spark. The other problem seems to be located, at least potentially, in the switches of the three burners that will not create a spark. I am interested to know if this is a possible diagnosis. If it is then when an expert is called to service the sealed burner that person could be expected to try to fix this second problem by dealing with the switches, rather than with all the sealed burners ? a more expensive and maybe unneeded fix. I want advice on this ? my first question Secondly, this second problem I might be able to deal with myself, by cleaning or possibly replacing the switches. (For our much simpler gas stove I?ve regularly replaced the electronic ignition modules.) My immediate problem is getting the ceramic cover off the switches to get at them. I?ve removed three sheetmetal screws that I can see when I open over door that are securing the cover, and it is now loser, but is still not free to be removed. Where are the other screws? ? my second question. Thanks.