It had to happen sometime
It was inevitable – someone brought me a euphonium. 2/3 valves will not go up and down. Fairly certain it is the valve guides, Yamaha guides fail if mistreated, and these sure look it.
In the past when asked if Inhorn does brass repair, I usually say no and send them to one of several friends in the area. Looks like that might be changing, as I am not in a position to turn down work.