Let’s back up for a second.
You laid off a tape to get color corrected? Or someone else is re-conforming the project at high res for you?
My first instinct is the post house you went to is doing something wrong or not communicating with you well about the issue.
Unless something went completely haywire with your video dailies, I really really doubt you have to “re-edit.”
The “A” frame is simply the first frame of a 5 frame sequence that turns 24fps film into 30fps video.