As Derek says style parts are on Ch 9 -16, so if you did not change that, those are going to be the channels to correct. When you use the punch in/out function you select the channels and bar number you are changing, and everything else stays the same. Before you start editing anything save a copy of the song by saving with a slightly different name eg put a 2 in the name. Then edit the copy that way no big deal if you mess up the editing. You always have the original and can repeat the process if you mess up.
If you recorded a lh voice (doesn’t sound like you did) then also no big deal because you will still hear it after you fix the chord. Then you can repeat the process by selecting those channels to fix that.
It’s not hard to find offending channels by putting them on and off while playing back the recording. You can also see which channels are containing data as they light up on playback.
You might find this process a bit trial and error first time, we all do, which is why you make a copy, but it is actually simple once you get the hang of it. And it is essential you learn how to do this and other editing if you intend to make multi track recordings.
Mike