Thank you. Seeing all the pictures and all of each picture helps a bunch. The anode WAS passivated and then “woke up.” The pieces that still are smooth amid the ones that are corroded tell that story. The anode definitely needs to be replaced as there is six inches of core wire exposed, especially on the bottom. The combustion chamber is middlin’. The roof looks good but the flue has rust and water marks. If you do anything, just replace the anode and nothing else. That’s not too much money to put into keeping the tank going, if that can be done.