I knew a couple of guys that did service for Gulf Coast. They were called to a spa that was less than 2 years old. The frame had collapsed, not really much anyone could do. I can't remember if that was covered or not.
Gulf Coast is made by HydroSpa. Hydrospa also makes the "Elite" from Costco.
BTW, Hydrospa was forced to stop branding those tubs as "Elite" as that brand name was already held by MAAX spas. They have been clearing them out at an extra discount.