Hi, I am nowhere close to being a hardcore collector like many of you guys are. I do have a fair amount of TV-DVD's, given my income (I have 130ish DVD's since I started collecting in late 2003). In the entire time I have been buying DVD's, I have lucked out and not had a duplicate disc end up in one of my sets. So, I have never had to ask how to exchange a disc if I had one that was missing or if I got a duplicate disc. Unfortunately, that streak ended today when I picked up a copy of Mary Tyler Moore S3. I got duplicate copies of disc 2 so I have no disc 1 in my set...I have already opened the set. I know you can mail in a disc if you got a duplicate disc and they will exchange it for the correct disc... I just want to know what the procedure is for such a thing like this? Thank you for being so patient and understanding with me.