You have a Progressive Dynamics PD4500 power center, including the converter itself; here's a link.
It and your trailer is still under warranty, right? Either your dealer or PD should fix it for you. I've never replaced the converter in a PD4500, but I bet it's fairly easy.
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch