it'd take me a lot of time to fix them myself as roblox doesnt allow you to change the meshid through console

1. Find the broken MeshPart, watch a tutorial explaining the absolute basics of studio if you cant do THAT
2. Replace its mesh id to "rbxasset://mesh/CHANGE", change the "CHANGE" to...
If you are changing the torso's meshId, replace the "CHANGE" with "Torso.mesh", so it looks like "rbxasset://mesh/Torso.mesh"