As always, almost no rust at the front bank IG coils whereas heavy corrosion at the ones on rear bank. ...
Good call to replace the header tank. It was already cracked and leaking the coolant. The coolant hoses were also didn't feel healthy so at the time of TB/WP service, it would be best to replace all of them. You can replace the header tank without loosing too much coolant but I always bleed the air afterwards ...