I have the 1 GHz version MSO-X 3104A and can take some pictures tomorrow.
Hint taken, and I'm willing to take photos of any area you'd like in more detail if you want to describe it. But if it means unsoldering the front end shield, I'm afraid I'm not up for that.
Thanks for your will to help!
Where are still much interesting with the shields intact:
- AA filter in fine details via the top side window (like Howardlong's);
- relays photo from the smaller bottom windows;
- photo of the board's bottom side (need to remove the main board);
- you can also try to read ASIC marking via the top window.
I'm pretty sure 3000 series 200-500MHz boards are trimmed of 1GHz 50 Ohm signal path routing. Like K201 unpopulated relay switching signal to the dead end.
This Dave's photo from 4000 series could be useful as a reference:
https://www.flickr.com/photos/eevblog/8181526726/in/album-72157631997535516/That's 200MHz board of 1.5GHz capable series. I think the alternative way for 50 Ohm coupling goes through K201 and further to that big 6 pin through-hole component. K203 may be left unpopulated on 1GHz board.