Get all notes associated with workorder using netsuite php?

Question

Hi i am using php toolkit to obtain workorders records with notes now i am fetching only workorder records and no notes present in response here is the code

$workorderId = '5504';
$request = new \GetRequest();
$request->baseRef = new \RecordRef();
$request->baseRef->internalId = $workorderId;
$request->baseRef->type = "workOrder";

$request->customFieldList = new \CustomFieldList();

$getResponse = $service->get($request);

i need to get all notes associated with transaction workorder from netsuite