diff --git a/source/packages/plg_system_mokosuiteauto/src/Helper/ServiceDeptHelper.php b/source/packages/plg_system_mokosuiteauto/src/Helper/ServiceDeptHelper.php
new file mode 100644
index 0000000..3816a3b
--- /dev/null
+++ b/source/packages/plg_system_mokosuiteauto/src/Helper/ServiceDeptHelper.php
@@ -0,0 +1,91 @@
+<?php
+namespace Moko\Plugin\System\MokoSuiteAuto\Helper;
+
+defined('_JEXEC') or die;
+
+use Joomla\CMS\Factory;
+use Joomla\Database\DatabaseInterface;
+
+/**
+ * Service department — repair orders, vehicle history, technician assignment.
+ */
+class ServiceDeptHelper
+{
+	/**
+	 * Create a service repair order.
+	 */
+	public static function createRO(string $vin, int $contactId, string $concern, string $type = 'repair'): object
+	{
+		$allowedTypes = ['repair', 'maintenance', 'warranty', 'recall', 'inspection'];
+		if (!in_array($type, $allowedTypes, true)) $type = 'repair';
+
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+		$filter = \Joomla\Filter\InputFilter::getInstance();
+
+		$ro = (object) [
+			'vin'        => strtoupper($vin),
+			'contact_id' => $contactId,
+			'concern'    => $filter->clean($concern, 'STRING'),
+			'type'       => $type,
+			'status'     => 'open',
+			'created_at' => Factory::getDate()->toSql(),
+		];
+
+		$db->insertObject('#__mokosuiteauto_service_orders', $ro, 'id');
+		return (object) ['success' => true, 'ro_id' => (int) $ro->id];
+	}
+
+	/**
+	 * Get service history for a VIN.
+	 */
+	public static function getVehicleHistory(string $vin): array
+	{
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$db->setQuery($db->getQuery(true)
+			->select('so.id, so.type, so.concern, so.diagnosis, so.status, so.created_at, so.completed_at')
+			->select('cd.name AS customer_name')
+			->from($db->quoteName('#__mokosuiteauto_service_orders', 'so'))
+			->join('LEFT', $db->quoteName('#__contact_details', 'cd') . ' ON cd.id = so.contact_id')
+			->where($db->quoteName('so.vin') . ' = ' . $db->quote(strtoupper($vin)))
+			->order('so.created_at DESC'));
+
+		return $db->loadObjectList() ?: [];
+	}
+
+	/**
+	 * Get open repair orders.
+	 */
+	public static function getOpenOrders(): array
+	{
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$db->setQuery($db->getQuery(true)
+			->select('so.*, cd.name AS customer_name, cd.telephone')
+			->select('TIMESTAMPDIFF(HOUR, so.created_at, NOW()) AS hours_open')
+			->from($db->quoteName('#__mokosuiteauto_service_orders', 'so'))
+			->join('LEFT', $db->quoteName('#__contact_details', 'cd') . ' ON cd.id = so.contact_id')
+			->where($db->quoteName('so.status') . ' IN (' . $db->quote('open') . ',' . $db->quote('in_progress') . ',' . $db->quote('waiting_parts') . ')')
+			->order('so.created_at ASC'));
+
+		return $db->loadObjectList() ?: [];
+	}
+
+	/**
+	 * Get service department dashboard.
+	 */
+	public static function getDashboard(): object
+	{
+		$db = Factory::getContainer()->get(DatabaseInterface::class);
+
+		$db->setQuery($db->getQuery(true)
+			->select('COUNT(*) AS total_open')
+			->select('SUM(CASE WHEN status = ' . $db->quote('open') . ' THEN 1 ELSE 0 END) AS awaiting')
+			->select('SUM(CASE WHEN status = ' . $db->quote('in_progress') . ' THEN 1 ELSE 0 END) AS in_progress')
+			->select('SUM(CASE WHEN status = ' . $db->quote('waiting_parts') . ' THEN 1 ELSE 0 END) AS waiting_parts')
+			->from('#__mokosuiteauto_service_orders')
+			->where($db->quoteName('status') . ' NOT IN (' . $db->quote('completed') . ',' . $db->quote('cancelled') . ')'));
+
+		return $db->loadObject() ?: (object) ['total_open' => 0];
+	}
+}