You need an authorized Roland REPAIR CENTER, not a dealer.
Use this link again, please:
https://www.roland.com/us/support/service_repair/service_centers/
If Carlton does not repair, ask them to remove themselves from the list of authorized repair centers in your area... thats false advertising. Use the link and find another close one. Be aware, they will be few and far in between. For me, I need to travel near 500 miles to the closest repair center, but 10 minutes from a local Roland dealer.