Stay in any job long enough, sometimes only a few months, and you will get the opportunity to redo something that you thought you had already finished. I'm not sure if this is due to the many quality checks of a big organization, or if everyone deals with it. It's actually quite positive for me to think of a redo this way, because in the moment it can be so frustrating! However, looking at it as part of the job, and something to do, and an opportunity to get it right, keeps it from being something I don't want to do.
There is a relaxing aspect to redoing something. You've been through it, you know the history, you know your way around the situation. Also, the first time something is done there is often urgency to actually get it done to meet some schedule, however, later the urgency to redo something is not the same. In other words, when someone assigns you the task of redoing something the question is hanging in the air, that no one ever asks, 'why didn't someone bring this up when we first looked at this?' The schedule has been blown out of the water, we screwed up once, let's make sure we don't screw up again. So I'm just going to take my time and do it right.