Generally, when an attorney dictates commas, periods, etc., I like to simply put the punctuation in place of the word. It doesn't change the meaning in any way and improves the readability of the transcript.
Recently, an attorney dictated the word "semicolon" from some text he was reading into the record. Now that I'm transcribing, that semicolon is really in such an odd place. I don't think any reporter would use a semicolon at that particular spot. I'm leaning towards writing it out.
What would you do? And thanks!