at-least re-cap your Color Classic MB now.  that cap goo once it starts to leak can go and cause significant issues.

Techknight and I both have a Dead Color Classic Board sitting on the shelf that either of us don't want to deal with right now

you run a color classic till it dies from bad caps... there is a chance it maybe still be dead after a recap.

LIkewise with the Q840av... You run that till it dies from bad caps... its More then likely dead. Those VIA's and traces on the 840av are mini micro tiny tiny tiny.

if you got the caps, you really should just do it and get it over with.

plus if they are not leaking as you say.. then removal will be easier!