/diy/ - Do It Yourself

After like a week Banggood agreed to replace the H8 mini that was damaged in shipping, so now that they aren't going to ask for another set of pictures I figure I'll see if I can repair it and not have to wait 3 weeks for the replacement to arrive.
The casing is twisted and broken in one place, but that should be a relatively easy fix with just some careful force and a little glue, but the bigger problem is that one of the motors isn't spinning. The one with the black sharpie scribble.
I've got basically no idea what I'm doing when it comes to electronics, but I can't see anything obviously wrong, so I'm not that hopeful, but maybe it's worth asking if anyone else can spot the problem or has some ideas to try.
Apologies in advance for the picture quality, I'll stick them on imgur instead of polluting the thread too much.
https://imgur.com/a/6k9Lp