Transfers: If you add or drop a course, fail to earn a C or better in a course or enroll in a new college after you submit your application, log back in and update your information online.
If you receive an offer of admission, be sure to confirm with the campus admission office that they are aware of the deficient grade or schedule changes. Although you must notify the campus of these changes, we cannot guarantee that a campus can go back to review an application after correspondence has been received. Make sure to save a copy of your correspondence just in case.http://admission.universityofcalifornia.edu/how-to-apply/after-you-apply/index.html
The change you describe sounds innocuous, but I suggest calling admission at each UC campus to get details on how they want to be notified. An ounce of prevention…