var chgTsk = new GlideRecord("change_task");
     chgTsk.addQuery("change_request", current.sys_id);
     chgTsk.addQuery("u_change_task_type", "Implementation");
     chgTsk.query();
     if(chgTsk.next()) {
          current.u_implementation_result = chgTsk.u_result.toString();
          current.update();
     }