suspect a new latch is all that you will need, rather than the whole door. Not worked on that year, for sure!
Are you familiar with some of the online help sites?
This is a new one for ID on the options on your unit and how to read it. Might be a place to start. Also I might get in touch with Winnebago for specifics but having the info on hand first might always help.
There used to be lots of info like what colors, sealers, trim, etc. and Winnebago has changed a bunch of the online so that I've lost track of how to find stuff but assume it is still there somewhere?
Start for ID: