New to SOAP and PHP, hopefully simple question :)

Hello,
   Here is my code.

<?php
$client = new SoapClient("https://gsx.apple.com/gsxws.wsdl");

Here is the Authenticate function that was returned on the __gettypes 
() call.:
SessionInfo Authenticate(string $userName, string $password, string  
$accountNo, string $language, string $timeZone)

$test = $client->Authenticate("[email protected]", "pass", "24521",  
"EN", "PST"); // This works
var_dump($test);
// code returned from var_dump = object(stdClass)#2 (2)  
{ ["instanceID"]=> string(1) "6" ["sessionID"]=> string(22)  
"z1AcbmuiCBF5FGKsekgTRM" }
$temp = array('', '', '661-3350', '', ''); // part array
$functions = $client->__getfunctions();
foreach ($functions as $func) {
   echo $func . '\n';
   }
print "<br>";

Here is the function I'm trying to use that was returned from the  
__getfunctions() call.:
ArrayOf_tns1_Part PartsLookup(SessionInfo $sessionInfo,  
PartLookupInfo $partLookupInfo)\n

$functions = $client->__gettypes();
foreach ($functions as $func) {
   echo $func . '\n';
   }

Here is the type I'm trying to use that was returned from __gettypes 
() call.:
PartLookupInfo { string description; string eeeCode; string  
partNumber; string productName; string serialNumber; }



Here is that code:

$temp = array('', '', '661-3350', '', ''); // array setup for type  
PartLookupInfo
$test = $client->PartsLookup('PartLookupinfo', $temp);

I get the following error:
Fatal error: Uncaught SoapFault exception: [ns1:at least one  
parameter required for parts lookup] at least one parameter required  
for parts lookup : in /Library/WebServer/Documents/shop/soap.php:10  
Stack trace: #0 [internal function]: SoapClient->__call 
('PartsLookup', Array) #1 /Library/WebServer/Documents/shop/soap.php 
(10): SoapClient->PartsLookup('PartLookupinfo', Array) #2 {main}  
thrown in /Library/WebServer/Documents/shop/soap.php on line 10

If I try this code:

$temp = array('', '', '661-3350', '', ''); // array setup for type  
PartLookupInfo
$test2 = $client->__call('PartsLookup', $temp);
var_dump($test2);

I get the following error:

Fatal error: Uncaught SoapFault exception: [ns1:Server.userException]  
GSX Server has encountered an exception at : 2007-08-15 18:24:21 Etc/ 
GMT, error reference tag is 6b8OYZ5NaAUzUeYZS4Gge0. If the issue  
persists, please report this to Apple. Details on how to report can  
be found at http://www.info.apple.com/gsx/gsxhelpform. in /Library/ 
WebServer/Documents/shop/soap.php:27 Stack trace: #0 /Library/ 
WebServer/Documents/shop/soap.php(27): SoapClient->__call 
('PartsLookup', Array) #1 {main} thrown in /Library/WebServer/ 
Documents/shop/soap.php on line 27


Again, I'm new to soap, so not sure why these errors are being  
generated. Any help to get me kick started would be greatly  
appreciated. :)

Aloha from Gale, Tammy and Jackie :)
[email protected]