How do you know if your electric steering rack is bad?

So, let me ask you this: how can you tell if your electric steering rack is on its last legs? Is it when you start feeling a strange resistance when you turn the wheel? Or is it when you hear a grinding or whining noise coming from the front end of your car? Maybe it's when your car starts to pull to one side while you're driving straight? Or could it be a combination of all of these things? I'm curious to know what signs and symptoms you should be looking out for to know when it's time to replace your electric steering rack.