I've exported shapefiles and SLDs from ArcGIS to deploy them on GeoServer. The client was using field names longer than 10 symbols so they got truncated, I get it. The field upon which the symbology is mainly built turned from SubTypeCode to SUBTYPECOD, ok. I fixed the .slds, so my rules became

    <Rule>
      <Name><![CDATA[Cable Duct]]></Name>
      <Title><![CDATA[Cable Duct]]></Title>
      <ogc:Filter>
        <ogc:PropertyIsEqualTo>
          <ogc:PropertyName>SUBTYPECOD</ogc:PropertyName>
          <ogc:Literal>941</ogc:Literal>
        </ogc:PropertyIsEqualTo>
      </ogc:Filter>
      <LineSymbolizer>
        <Stroke>
          <CssParameter name="stroke" >#00ab1a</CssParameter>
          <CssParameter name="stroke-width" >1</CssParameter>
          <CssParameter name="stroke-opacity" >1</CssParameter>
        </Stroke>
      </LineSymbolizer>
    </Rule>

On the other hand, my data view says

But it simply does not apply, I can clearly see that it's falling back to the default symbolizer that is in the end of the .sld. Did someone ever had something like that?