Is it the shifter or cables?? If its the shifter just get the thing apart and spray lithium grease in there.
If its the cables, you might have to pull and inspect it. If its ripped somewhere along the length and its corroding it will just get worse, and could fail (just image how that could turn out)
I know they run cable in a torturous route in CCs. At least you can get a good look at it, deal with the whole thing and lube it well. I'd use lithum grease.
Good Luck
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