Actually the title tag is in the
/skin/common_files/customer/service_head.tpl file:
Code:
{get_title page_type=$meta_page_type page_id=$meta_page_id}
Its built using a smarty function in
/include/templater/plugins/function.get_title.php... You should be able to look through there to see how its put together. Just remember to set your default title in the SEO section of the admin panel.