Both sides are responsible.
Asus will give you a warranty if it wants to solve this case easily. In this case, EPP is the easiest. But if you start burning from the net like this, it will be difficult for EPP to shirk its responsibility, because they provided those wires.
It's hard to say clearly, as a consumer, just don't be too good to suppliers. After all, the security problem has been designed. The equipment is on fire.
Please call 123 15 if it is not handled properly. Please also call 123 15 if you want to solve it quickly.