XML to Linq C#, no results

I'm trying to grab the Filename from the below XML code where the partNum passed in by the end user matches the partNum of a JES. My current code yields 0 results.

I will also be trying to grab the disrete attribute as well.

<JESs>
    <JES partNum="116102440002" discrete="true">
       <Filename>116-10244-0002_ILLK Collimator Cover Assy_Rev 3.docx</Filename>
    </JES>
    <JES partNum="116102440003" discrete="false">
        <Filename>ILLK Collimator in Gimbal_Rev 4.docx</Filename>
    </JES>
    <JES partNum="116102440004" discrete="true">
        <Filename>116-10244-0004_Collimator Cover Installation_Rev 1.docx</Filename>
     </JES>
     <JES partNum="116102440005" discrete="true">
        <Filename>116-10244-0005_Collimator Lens Assembly_Rev 2.docx</Filename>
     </JES>
 </JESs>

C# Code

var FileName = (from n in xml.Descendants("JESs") where n.Element("JES").Attribute("partNum").Value == Convert.ToString(partNum) select n.Elements().Descendants().Elements()).ToList();