XmlParser - finding a child value &returning a parent value

I searched through all the XmlSlurper codes and not helping in my case. I have a return of devices that each MAC Address has two ports and various child values, one of which is the phoneNumber (did).
However I only have the phoneNumber (did) to search with and want to pull the macAddress that it belongs to.

Here is a sample of an XML testStep in SoapUI

    <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
       <SOAP-ENV:Header/>
       <SOAP-ENV:Body>
          <ns2:GetDeviceServiceDidMapResponse xmlns:ns2="http://xyz" xmlns:ns3="http://xyz" xmlns:ns4="http://xyz">
             <ns2:deviceUnits>
                <ns2:macAddress>FFFFFFF202B2</ns2:macAddress>
                <ns2:deviceTypeId>770</ns2:deviceTypeId>
                <ns2:numberOfPorts>2</ns2:numberOfPorts>
                <ns2:devicePorts>
                   <ns2:portNumber>1</ns2:portNumber>
                   <ns2:serviceEntities>
                      <ns2:networkId>16869460</ns2:networkId>
                      <ns2:didTargets>
                         <ns2:did>11002003000</ns2:did>
                         <ns2:didType>PHYS</ns2:didType>
                         <ns2:startDate>2012-09-25</ns2:startDate>
                      </ns2:didTargets>
                      <ns2:startDate>2012-09-25</ns2:startDate>
                   </ns2:serviceEntities>
                </ns2:devicePorts>
             </ns2:deviceUnits>
             <ns2:deviceUnits>
                <ns2:macAddress>ABCDEF123456</ns2:macAddress>
                <ns2:deviceTypeId>701</ns2:deviceTypeId>
                <ns2:numberOfPorts>2</ns2:numberOfPorts>
                <ns2:devicePorts>
                   <ns2:portNumber>2</ns2:portNumber>
                   <ns2:serviceEntities>
                      <ns2:networkId>16869466</ns2:networkId>
                      <ns2:didTargets>
                         <ns2:did>12003004000</ns2:did>
                         <ns2:didType>PHYS</ns2:didType>
                         <ns2:startDate>2012-09-25</ns2:startDate>
                      </ns2:didTargets>
                     <ns2:startDate>2012-09-25</ns2:startDate>
                   </ns2:serviceEntities>
                </ns2:devicePorts>
                <ns2:devicePorts>
                   <ns2:portNumber>1</ns2:portNumber>
                   <ns2:serviceEntities>
                      <ns2:networkId>16869467</ns2:networkId>
                      <ns2:didTargets>
                         <ns2:did>12003004001</ns2:did>
                         <ns2:didType>PHYS</ns2:didType>
                         <ns2:startDate>2012-09-25</ns2:startDate>
                      </ns2:didTargets>
                      <ns2:startDate>2012-09-25</ns2:startDate>
                   </ns2:serviceEntities>
                </ns2:devicePorts>
             </ns2:deviceUnits>
          </ns2:GetDeviceServiceDidMapResponse>
       </SOAP-ENV:Body>
    </SOAP-ENV:Envelope>

In here I want to FIND the phoneNumber (did) 12003004001 and report back the macAddress it is set to ABCDEF123456.

So far my code is:

    def response = context.expand( '${getDeviceServiceDidMap#Response}' )
    
    def xml = new XmlSlurper().parseText(response).Body.GetDeviceServiceDidMapResponse.deviceUnits.devicePorts.serviceEntities.didTargets.find
       {it.did == "12003004001"}.???????.text()

The ? part is where I'm not sure what I'm doing - I tried setting the path to the macAddress but nothing is working.

Thank you,
Rob