This will be the 6th growing season without repotting. The drainage seemed a little impeded last year so I removed the top 1" of soil and replaced it with new (soji). Also, if you look closely you'll see a guy wire/turnbuckle pulling down the top right branch of the crown which was growing horizontally. Look at some older photos and you'll see the hole it created below it. It was bent using the same undercut technique as done on the right trunk.