How do I find the manufacturer of my DVD?

I have Castle Season 3 on dvd (5 discs). The fifth disc is cracked on the clear inner ring and there are pieces of it that are chipping off. I've researched ways to fix it, but I can only find tips for if it's only scratched. I went to the store where I bought it and told them my situation. They told me that I should contact the manufacturer. The back of the case says "Refer to inner ring of the disc for manufacturing information" but that doesn't tell me anything as the inner ring just has a bunch of numbers that mean nothing to me. It also says "Distributed by Buena Vista Home Entertainment, Inc." Is Buena Vista Home Entertainment the manufacturer? If not, how do I find the manufacturer? Thanks!