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I 'd change not only all capacitors, but the whole XPander and move to another neighborhood - just to make sure.

Change all capacitors, is not a good advice to a laymen. It can do more much more damage than the defect currently observed.

My advice would be to put more effort into locating the defect first, than just start some tedious solder work. IMHO the capacitor swapping thing is very fashy but often to no avail. Capacitors may break indeed, but no as often as indicated in these nice forums here. In fact, in the way over hundred of 80ies synths I had to repair, the capacitors only rarely had a problem.

I've seen lots of broken CMOS (40XX- and 45XX-type), OP-Amps (TL-type) and even resistors and ceramic capacitors (I've never read in a thread to change resistors or ceramic capacitors, but, yes the tend to break, in particular in California made Synths ;-)

I also note that electrolytics of that era are of much better quality as the material sold today.? Why would you swap a electronic element, known to last more than 50 years, for a new part calculated be clever engineers to last ten years at most.

There are weak points in the Xpander VoiceBoard though:

the CMOS ICs and

the Styroflex S/H-charge capacitors.

Those components weren't build so well those days and tend to break quite often, that is, to become short, open or some? state of random switching in between (funny).

Soldering of Styroflex caps is difficult and requires some experience. The must not get hot! There is no need to use Styroflex type again. You may use modern cap types here.

With you tunig problem, I'd first try to locate the tuning circuit in the schematics? (or ask s.o. here) and then change/swap? only t the parts for that functional instance. I'd start swapping the CMOS, then checking the S/H caps there, then the OP-Amps involved, then the electrolytics there.?

Soldering of Styroflex caps is difficult and requires some experience. The must not get hot! There is no need to use Styroflex type again. You may use modern cap types here.