How Do I Get My Broken Ps3 Fixed?

One day around a year ago my ps3 decided to quit reading discs.. I've tried everything to fix it, then ended up opening it just to take a look. Couldn't figure it out. I know that it will cost money to fix because I opened it, but what do I do to get it fixed? I dont have the original box for it, so do I just wrap it up and send it to the ps3 company or something?

Suggestion:

You can ask the store that sold it to you. And Sony should offer repairs.