Actually, all of the files are in /blog/, so the file you’re looking for is here:
https://www.rogomo.com/blog/wp-content/themes/Mandingo/images/header.png
That said, nothing shows up, so I don’t know wha that means.
Nothing should have changed with the server as far as I am aware… thanks for your time and thoughts!
Steve
Edited to add: I think I may have just figured out the problem. Will test my theory and re-post if it works.