Vintage Synth Repair

I just acquired an EP-7 digital piano.  Overall does
what it's supposed to do, but two keys will only sound
when struck quite vigorously - and then, of course,
they're LOUD.

I'm hoping this is a simple case of contacts needing
some cleaning.  Am I on the right track?  Are these
metal contacts or some sort of conductive rubber? 
Appreciate advice on recommended cleaning chemicals.

I'm experienced at doing electronic repair, but not a
controller for a keyboard.

Thanks in advance....

WCB Dave


	
		
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