I think they are both acting shockingly trying to pass the buck like this.
This may be of interest:
As I suspected, the responsibility is with the retailer first and foremost. They may suggest it is easier to go direct to Asus (who the warranty will be with). I actually think Asus is behaving badly however you might want to get Scan to 'have a word' with them because as per above it is ultimately Scan's responsibility.
You could either ask Asus WHY they won't just take it for repair or tell Scan that you are aware that legally they are responsible under the Sale of Goods act for the repair of it and you would like them to take it up with Asus on your behalf.
Let us know how you go.