I don't know that the mylar will correct anything but applied correctly it may prevent the situation from getting worse?

It sounds like a screw that is too long was used on the slot kickout solenoid bracket. There are only 2 screws holding the bracket in place and it was common for them to come loose and the holes get stripped. Unfortunately it was also common that some operators used a bigger, longer screw to fix the problem. So first thing is first, check the screws holding the bracket in place. I suppose it's possible the area can be made flat again, but I don't know the best way to do that. Perhaps someone else might have a suggesting for that.

Rob

Rob G nailed it. You'll see many TZs where longer screws have poked through the playfield there. Some can be repaired by a pro. Others aren't worth it. If you can cover it up again and not have it bother you, I would just do that.

After ensuring the screws are correct, I would take a real good pic and send it to one of the playfield restorers for their advice.

Yeah I have the same thing, and have seen it on others. Put a small circle mylar over it and it has never bothered me and never really noticed it changing the ball roll so no big whoop.

You could make it flatter if you can get a clamp on it. Worked great on my slot kick out that was coming apart but that's a lot easier.