I've been calling around; I just called Gruber to confirm what I have learned so far. As far as I know it's either Javier, or Fernando at Tesla Long Beach. Javier is busy and so is difficult to confirm an appointment with (for me at least), but I just spoke with him and was able to explain the urgency of my maintenance issue and so was able to set up a time.
I've read some posts on here about Tesla Pomona performing Roadster maintenance but I have not contacted them.