Concerns purchasing Vintage System?

The horns in a LaScala have no surrounds. Those are the only things behind the grille. The woofers will have a treated cloth accordian surround, which cannot rot. Getting to the woofers would be more trouble than it's worth. As long as you're not hearing any odd noises, don't mess with them. Regarding the electronics; just plan on at least replacing all the electrolytic filter capacitors in the power supplies, regardless of how they appear to the eye. Electrolyte dries up(impedance and ESR rise) over time, and caps often show no outward sign of defect.