Just to bring closure to this:
I used the information in post #11 by bobterry in this thread to repair my cluster:
http://www.peachparts.com/shopforum/showthread.php?t=79302
I replaced the capacitor myself. The repair was successful and has worked reliably for a few years now!
The capacitor needed is a 470uf Electrolytic capacitor
(Radio Shack - 272-1030) I believe it is the largest capacitor on the board, and certainly the only 450uf, so it should be easy to find if you can't find the other post.
If you want to do this yourself, but are not experienced with soldering on multi-layer printed circuit boards, you should take the board and capacitor to an electronics shop to have the soldering done!
ProgRama is also good source to get MB electronics modules repaired.