onkyo selector switch issue

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I have a vintage onkyo amp that I want to use to power my upcoming project(for the time being). But it has one problem...Certian imput selections don't engage cleanly. It is obviously an issue with the imput selection switch. Do you think that it would be possible to find a replacement for such a vintage amp? If not what could I do to improve the conductivity of the contacts inside the switch? I was thinking about seeing if there is a way for me to shoot some detox on it to try to fix it, but i thought i'd ask for some suggestions first.

my apologies for not remembering the model number, i'm not at home now so i can't check on it.
 
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