The problem is that discs 5 and 6 of season 4 would not play. I tried the discs in two different players with no success. A total of 6 episodes were unwatchable. I purchased these about 6 months before I played them and it was past the return window when I discovered the problems. I would only want to be able to replace Season 4 Discs 5 and 6. Can someone help me out here?