If it is some oriental ***** of ****, throw it away and buy a wood piano. The only reason I'm responding it is vaguely possible an old Kurzweil was made in USA. E caps, contacts, connectors, mostly, occasionally 78xx regulators or 39xx or 29xx op amps. Organs, "pianos", hifis, all about the same problems. Get on and read the safety sticky thread, you need to follow those procedures to avoid hurting/killing yourself when repairing electronics. The ones nearest the power transformer are the ones most likely to go first, they get the hottest. They are also one of the few parts that can be replaced - unless they get so bad they short out the power rectifier (cheap) or power transformer (expensive and usually impossible to find). Yeah, at 15-20 years of age electrolytic capacitors are a a bit of a sure shot be going bad.
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