Yeah, if the caps don't kill it, a component will just randomly fail. My Linksys LNE100TX PCI network cards just randomly die after 5 years. Maybe ISA is made of sterner stuff.

I agree with Bitt. While you've got the machine working, build a backup in parallel. You've got plenty of time to test it before the Win 3.11 machine fails and there's a huge crisis.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set