update on my service: it went well. the SA guy was nice, he didn't offer uber credits at first, I asked him just to book me a ride there and one back when the car is ready and I'll be good. he did that. I had to remind him for the return trip, but he called an uber for me and that all worked. so, the sunnyvale location does know how to book you an uber without you having to install the app. I do appreciate the extra effort they went thru on the uber thing.
the car was in for almost exactly 1 day (about noon till noon the next day). they replaced sway bar links and when I got the car back, the clicking noise was gone. I am not sure yet, but the front end seems more tight or responsive, now. very slightly, but I think this was good on several counts. I searched the net for this topic and, yes, it seems that it happens on many makes and models. don't know why, but it happens - so I do believe their explanation.
when I was there, another customer was asking for a loaner and the SA was trying to gently explain that 'that ship has sailed, this is the new bigger tesla' (or to that effect, those were not his words, lol). so, even though some SCs might be giving out loaners, I expect ALL of that to go away. I don't think the uber-credit thing is a california thing; I think its a deliberate direction and I'm not sure they plan to return to the loaner concept. with the Y coming soon, there will be even more traffic (lol) at the SCs and if they can't keep up now, well ...
anyway, other than the uber thing, I give them a good rating for this visit. it was minor, true, but it was handled well. no charge, warranty coverage for this one.
if the issue returns (it has, for many posters, I've learned) - I'll update again.