Fix them, you have them, so get them both refreshed with new caps, clean pots and switches, and enjoy them.
There are ways to stabilize those vertical daughter boards in the preamp so the joints don't fail.
I'd desolder and resolder each Molex pin and socket properly with good fresh rosin core solder paying attention to get the Molex connector pin up to proper temperature. The rosin flux will help make a good joint, better than No-Clean flux on those old pins.
Just went through this on the Phase Linear cassette deck I'm rebuilding. Desolder the joint with wick or a vacuum unit, clean with alcohol and a acid brush, resolder with rosin core solder with most of the heat on the pin. Would perhaps be good to even have a tin of extra rosin flux, some pins might need it.
Then clean, clean, clean those boards spotless of all that flux with alcohol.
Use No-Clean elsewhere on the boards, but rosin on those pins, and get them up to temp first. With good technique and equipment, I think the issues can be overcome.