+1, @jond
Dan at Modwright has been doing it for years. His latest innovation is Analog Bridge. Check it out!
https://www.modwright.com/products/analog-bridge/
Who still does mods for CD players
Years ago I sent my Sony SCD 777es to Richard Kern and had a number of things upgraded. I tried to find info on him again, but came up with nothing. Is there anyone around anymore doing the same kind of work?