I think that, having sized up the problem in the light of these posts, I'll shoot for the tantaliums, 47µF 16+v, and that I'll also replace whatever else is on the board capacitor-wise while I'm at it, following the last piece of wisdom posted. I thank you all again for your advice, which has been much appreciated.

One more contribution would be welcome. My soldering experiences are limited for the most part to cruder devices, but not being an unhandy klutz, I am happy to give the SE/30 fix a go. In this light, is the removal of the old capacitors a task requiring anything other than the usual: an hour or so, a steady hand, a low wattage iron, some braid to soak up the old flux, and a beer? It looks a slightly delicate operation, but presumably I just remove the cannisters' terminals by desoldering them at the surface, one by one, and all will be well.