Hi John,
I would recommend you to send your device to service center for further examination.
It's really strange and not about the warranty thing you said....
if it's our official service center, it of course accept device with global warranty and local warranty in your region.
Unless your device is having local warranty in another region, do you want me to check for you?
Please refer to below link to find the official service center.
If it's really too far away from you, you may also email or call local team to arrange to send it in.
Encontre uma assistência técnica ASUS - Brazil | Suporte Oficial | ASUS Brasil
Thank you.