Hi, I had they same problem with my MBP a few weeks after i bought it. See this thread
https://forums.macrumors.com/threads/579749/
The superdrive made a really loud noise when you put a disk in. When I took it to the Apple store the genius said I must have been putting too much pressure on it or picking it up on that side with one hand. I had only had the MBP for a few weeks and had been very protective of it, I hadn't dropped it either.
The genius agreed to replace the superdrive when he heard the noise it made. I got a call from the technician telling me not to put pressure on the right hand side, he didn't believe me when I told him that I didn't do it.
When I got my MBP back the superdrive was replaced but the metal casing had just been pushed back into place. It was still a bit saggy but worked fine.
Hope this helps, good luck.