Has anyone upgraded their Ayre AX-7 to

This integrated amp sounds great already. Is the upgrade significant? Does anyone know what the upgrade consists of. The Ayre web page does not discuss the new series. Is upgrading the standard factory power cord supplied with the AX-7 significant? If so does anyone have any reasonable cost suggestions? Are there any other tweaks to this integrated amp that make it sound even better? Myrtle blocks, etc. Thanks in advance.