The problem with Roadsters and Service Centers is that they don't get a lot of them. A tech may work on a few Model S's a day, and one Roadster a quarter. (Made up numbers, but you get my point) And the solution to most problems is to replace large expensive assemblies at a cost of many thousands of dollars. (Battery, PEM, drive/transmission, etc). They don't really repair things, just replace, from what I've been reading online over the last year. There's apparently a tech in the Cali service center that seems to like digging into Roadsters and finding out the 18¢ component or the loose wire that's causing the $10,000 part to fail, but they just don't have the time to do that at service centers.
In my experience, other than specific campaigns, they're not going through your car at visits to find things they can replace under warranty (contrasted to traditional dealers that actively do this in order to both make more money themselves and save their customers money, while increasing goodwill feelings and forming a relationship with the customer). I enjoy(ed) the experience of service at premium marque dealerships a lot more than my Tesla service experiences. But I know that they provide that experience because they're making lots of profit on the service work and Tesla says they keep the service side a break even proposition.
With respect to loaner cars, call ASAP because it might be weeks or months before one is available for you. They may offer an Enterprise rental car if that's acceptable to you.
Denver is saddled with a way-too-small service center and an exploding customer base. I don't think they've gotten me in for an appt in less than 3 weeks, nor kept my car less than 2-3 days, regardless what the issue was. So keep that in mind with your planning.
Sorry this sounds so negative. I do love Tesla but have had some very expensive issues lately.
