There are a couple of ways you can resolve this issue, depending on what isn't working. As it's difficult to determine by the brief description of the problem you're having, I can't tell if the main spark (ignitor) module is the faulty component, or if you need to replace a specific ignitor/orrifice assembly for one or more burners.
If none of the top surface burners are lighting when you turn them on, it is most likely the spark module that needs to be replaced. If it's only one burner that is not lighting, then you'll need to replace that burner's ignitor/orrifice assembly.
To get at these components, all you need to do is lift up the top range surface to expose the burner assemblies and the spark module. Be sure to turn off the gas line and unplug the range from the electric outlet to prevent any shock hazard, etc. Removal and replacement can be done with simple hand tools and by simply unplugging the electrical plug on the spark module.
Here's a exploded line drawing showing the components, part numbers, and a price list as well. You can order the part(s) needed online as well.
http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=PLCS389DCC&productCategoryId=0122008&brandId=1428&modelName=DUAL-FUEL-RANGE&diagramPageId=00002&componentDescription=BURNER&documentId=R0504191&backToLink=Return%20to%20Sub%20Components%20list
Hope you find this Very Helpful and best regards!
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