Mk IV Columbus radio questions

Hi there - two questions:

1) Is it possible to retune the DAB radio without wiping out all of the set favourites? The only way I have found to do this is by using the Setup Config Wizard - but it wipes everything

2) The manual suggests I should be able to get AM radio, but it doesn't seem to be an option on mine. Anyone had this problem and solved it? I know it's not the biggest loss in the world, but AM is just handy for listening to BBC 5 Live in remote areas.

Thanks