A lot of Hobby places like Hobby Haven or Hobby Lobby will sometimes have replacement parts depending on what is nearby you. We had one fall out of the sky over a bean field. It got returned about 3 months later after the owner of the field almost hit it with a combine. It was filled with dirt, water and bugs. I cleaned it out the best I could and took it in to Hobby Haven. Described what happened. They tested the leads on the arms and motors and replaced a couple of them for us. It fell because apparently over time the batteries on the Vision 2+ (the one in question) fail and expand and lose consistent voltage. They surprisingly didn't end up charging us for the motors but we've bought several drones from them so that may be part of it. If you're able, you could try finding replacement motors from one of those kind of hobby shops and do it yourself otherwise there are several online sites that specialize in hobbyist and robotics motors that would probably do what you needed. I would just run it through many rigorous stress tests before putting at any sort of altitude. Also keep in mind if you don't have some "authorized" person/place do the repairs you may end up voiding your warranty anyway. And even they may still void it. If you can, I'd just RMA it straight away and get something that is guaranteed to work.
Before you get too far into it though, you may just want to open it up which is fairly easy, and check to make sure you didn't just crack some solder joints. That would be a simple fix that you could likely do in house or have someone do it for cheap.