Well, I managed to pick up a soldering iron today. The connection was bad enough that I wasn't able to reposition the wire, so I ended up just heating the solder and removing the wire from it. I plan to use solder braid to get rid of the solder there and attach it with new solder that I bought, but I am pretty certain at this point that this is not Morty's main issue. I tried running him with the wire entirely disconnected, and he still behaves exactly the same as before, which would be odd if this wire is the issue since his behaviors seem to suggest a bad connection rather than no connection at all. Still, I'll try getting this wire attached properly and see if it helps. Has anyone used solder braid before? Some advice on how to use it properly would be appreciated if so!