I decided to use an official source for information: the in-car nav. What I see in my S right now is that Vacaville is not operational. I also see that Gustine, Buttonwillow, and Bakersfield continue to be not operational.
All other California Superchargers show as fully operational except for Fremont (#1, the location at the factory right next to the delivery center area) which shows "Reduced service". That is likely not related to any of the non-operational locations.
IMPORTANT: Now that we have realtime Supercharger status in the car nav, use it! Before starting out on any trip where you will be using a Supercharger, check its status in the car nav.
Does anyone have experience with trying to navigate to a Supercharger that is out of service, or having the SC go down while they are routed to it? I sure hope there is an error message or something.
Last September we were travelling and arrived at a SC to find it down. There was no message, but it was a fairly recent development due to a storm causing an area-wide power outage. When we called Tesla for assistance, they did not seem to know that it was down, and could not tell if the next SC was functional.