$publicKeyManagementServiceRef = $wsmanConnectionObject.NewReference("SELECT * FROM AMT_PublicKeyManagementService WHERE Name='Intel(r) AMT Public Key Management Service'") 
$url = "http://issuerURL.demo.com"
$serialNumber = "6thBACoJqACYDiIAHwAAAA=="
$inputObject = $publicKeyManagementServiceRef.CreateMethodInput("AddCRL")
$inputObject.AddProperty("Url", $url)
$inputObject.AddProperty("SerialNumbers", $serialNumber)
$outputObject = $publicKeyManagementServiceRef.InvokeMethod($inputObject)
$returnValue = $outputObject.GetProperty("ReturnValue")
if($returnValue -like "0")
{
	$crl = $outputObject.GetProperty("CRL") 
}