Hi Ray
Of course Yamaha maintains support internationally for all it's current models and recent models, but not sure how many years later it is required to keep available all support links.

Support is generally easy to find for old or even vintage gear as many forums and enthusiast sites keep posted information. I am sure Yamaha currently has Australian support if you were to Google search from there.

Here is the link from the Yamaha US site for support for the PSR-E453.

http://usa.yamaha.com/products/musical-i...oards/psr-e453/

Marcus