Likely the reverse cable adjustment HOWEVER...these things are kinda bad about breaking that reverse lever thing that sits on the transmission. In fact, thata was the only problem we ever had with our Carbide. I suspect yours may have crapped out. Get a flashlight and look at the piece that the cables attach to in the back and make sure it isn't cracked.
If it is, the replacement pieces are pretty cheap and are actually made out of metal and shouldn't break.
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