I can not find the HW Warranty status that was present on the previous version of Open-Audit. Has it moved, it used to be in "device details" at /open-audit/index.php/devices?
Manufacturers keep changing their websites so the links more often than not don't work. We're working on a way to let the Open-AudIT user update the links and when we display a device, create the link based on that entry. For now they're not in the 'bootstrap' template.
Having said that, you can still see the old links on the old 'tango' themed page. If the id of the device in question is 88, you will normally see a URL of /devices/88. Change this to /main/system_display/88 in your browser and you'll get the old 'tango' page with the link(s).