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You might try partially unseating and then reseating various chips, to make sure the connections in the sockets are clean. Just pry them up a little and push them back down. Can't hurt to do this to all the chips in the CPU section.
It's also possible that the EPROMs are fading. If you have access to an EPROM eraser and programmer, you can reprogram them, using the files on the RhodesChroma.com site.
It would also be nice to know if there's any significant ripple on the supplies, especially the digital +5V. Do you have access to a scope? Sometimes they look good on a meter, but are noisy.
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Ciao, Paul D. DeRocco
Paul mailto:pderocco@...