Cannot output results of WPDB query to drop down list

Hi,

I have the following function to display values from a custom database table in a DDL.

function DDL_Sob($form){
    //only populating drop down for form id 27 - Referral
    global $wpdb;
	if($form["id"] != 27)
       return $form;

	$sql = "SELECT * FROM <code>bus_source</code> ORDER BY name";
	$sobs = $wpdb->get_results($sql, ARRAY_N);

	//Creating drop down item array.
    $items = array();
    $items[] = array("text" => "", "value" => "");

    foreach($sobs as $sob)
        {$items[] = array("value" => esc_attr($sob->name), "text" => esc_attr($sob->name));}

    //Adding items to field id 15. Replace 15 with your actual field id. You can get the field id by looking at the input name in the markup.
    foreach($form["fields"] as &$field)
        if($field["id"] == 15){
            $field["choices"] = $items;
        }

    return $form;
}

In mySQL the results are generated and in GF/WP the SELECT/OPTION statements are generated for each row but the values/text are empty as in:

<select>
<option value></option>
<option value></option>
<option value></option>
</select>

Any suggestions as to what I've gotten wrong?