No and no. You'll likely just write a simple addendum and that will be that. It wasn't a scored section violation so it's not a big deal. And most schools only care about your highest score so just see how you did and plan from there.
LSAC won't be willing to change anything, and the JC has no control over it. You could include an addendum, but if you do it should be very very short, like 1 or 2 sentences (adcoms don't want to have to read even more).
@Pacifico My point is that undergrad scholarship and GPA are already included in the application and being considered. To restate facts is redundancy not addendum.
Do not write an addendum, unless you withdrew from or failed a class then writing an addendum will only hurt you in this circumstance. It seems unnecessary.
No, do not draw undue attention to this with an addendum. It's one class and it's really not a big deal in the grand scheme of things. You want to write as few addenda as possible.
... super crucial in an addendum:
writing an addendum should show two ... , and don't write an addendum because quite frankly, you don ... to it. Especially if your addendum will only show that maybe ...
No addendum necessary, they will see your transcripts, and even if they couldn't see this in the end all they really care about is that you were awarded a degree.