I just got off the phone with Californeon who manufactures the flat light strips for our coaches. I'm not sure when Newell started installing the blue signage lighting and when they stopped, so I'm not sure what years this system was used in Newells. Californeon verified that our system is obsolete. He did say that they would continue to make the inverters for the system on a special order basis. He stated send an email request through their web site and they would let you know the cost. The inverters are the weak link and every one who had a light out has fixed them by replacing the inverters.
http://www.californeon.com/ and use the "request a quote" button at top
Hope this helps.................