Think cheap.first change the mic to see if that makes a difference. If it does you now have a new mic and a radio that works.Now it gets a little more expensive. you have to open the radio so the components show . Now ask yourself which one does what ? I know you can't answer it because if you could you wouldn't have posted this. I can tell you that its in your audio circuit . Now take it to a tech and have them fix it.
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