You are doing the right things, to unplug and replug or clean the pins.
Now, you need to unplug each multi-pin cable one at a time and slide
each back into its socket. That may catch some oxidation of contacts
and remedy it.
Another observational trouble shooting aid, is to check the temperature
of the ICs to see if anything is abnormally hotter than its like
components.
After 15 years, contacts in plugs and sockets may have light oxidation
presenting the symptoms you report.
Also, solder that old may have a marginal connection that has failed.
Look with magnification for any cracked solder joints, not well wetted
joints, and anything especially in the logic circuits.
GL,
Stuart Rohre
K5KVH
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