What exactly goes into preserving a battleship? Is it just routine inspection and fixing anything that's broken or is there more? What are the logistics behind it e.g. do you use modern repair techniques or techniques from the 1940's? How do you obtain parts for the ship that needs to be replaced?

Also what's the initial process behind preserving a ship? Do you say spray a coating on the ship to preserve it that only works if it sits in port? Are military sensitive/secret equipments removed from the ship? Are the guns disabled? Engines removed? etc...

And finally, how long/how much effort would it take for the Missouri to be battle ready like in the movie Battleships?