Your remote control is a LINC brand. It's manufactured in China (isn't everything these days?) and marketed by Lippert Industries in South Bend, IN.
You can find some information about one LINC remote control at this link:
https://store.lci1.com/linc-remote-c...er-power-relay
I don't believe this is the specific one that is installed in your RV, but you can contact Lippert Industries at 574-537-8900 and discuss your needs with their service rep. You'll need as much information as possible when you contact them. Your RV VIN, year and model as well as the information on the ID tag on your failed remote control receiver.
If I were you, I'd talk to them initially about the best way to troubleshoot and confirm exactly what you need to replace. They may be able to walk you through some instructions for testing the system and possibly a reset capability that "MAY" (no guarantees) get your current receiver up and running without having to replace expensive components. In the event that you do need to replace anything, they are the "distributor" for the RV manufacturers and will sell to the public.
Good Luck !!!!