Although it's not related to your problem, you should think about upgrading your converter to a modern multi-stage converter. Your house batteries will last longer with the new technology. I did it on my 2002 35U and it's a pretty simple process.
Here's what I used for a replacement ($117 at Amazon):
https://www.amazon.com/Powermax-Supp...5+%2855+Amp%29
On mine, the color codes on the wires weren't logical and didn't match Winnebago's wiring diagram, so be careful. My advice is to unscrew the existing converter from the floor and pull it out so you can see all the wire connections. Carefully disconnect one wire at a time, noting the name on its terminal and connect it to the matching terminal on the new converter. You may have to unscrew one or more wire "hold-downs" to do this. Once all the wires have been connected to the new converter you can mount it to the floor and re-secure any wire hold-downs.
I didn't do this, disconnected all the wires and connected them to the new converter in what seemed to be the logical order based on conventional color codes. As soon as I flipped the breaker, the new converter started smoking and blew it's internal fuse. Fortunately I was lucky and it seems OK after I replaced the fuse. I monitored the voltage output periodically and it's stepping through the charge phases as it should.