Yes, I see the same thing but for some reason the T-Gap site I am monitoring shows the alt CC freq for Stanley Canyon as a neighbor. It is probably the one it is changing to either temporarily or permanently.
Maybe the site will come back up as part of Zone 6?!?!? Nah, that's probably a little far fetched.
That aside, perhaps Stanley Canyon is undergoing a repeater replacement. There have been notes from the CCNC that they were working in replacing/updating repeaters for different sites which will cause downtime. They also noted that non-state owned sites need to plan on replacing older repeaters with new ones due to the Motorola Lifecycle Roadmap.
IDK if its my radios or my hearing, but since Stanley Canyon site cam back on,my radios appear to be working better. Much clearer audio, talk group tracking is crisp instead of choppy. Hope it stays that way!