Vintage Synth Repair

Hello,
     I have a question that maybe someone could
suggest a solution to.  I have a Crumar T1 organ that
prouces a "crackly" sound when some of the keys are
depressed...I had cleaned the spring contacts a few
months ago with some electrical contact cleaner that I
purchased at Radio Shack, but the problem seems to
have come back somewhat...Any suggestions?

Best,
James

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