RF90 phase for ASC-AS_A was totally off this morning but AS_B was good, it turns out that somehow the whitening and awhitening didn't match for AS_A (first attachment).
In the attached 2-days trend of analog whitener (ch1) and digital anti-whitener (ch2) (second attachment), the second stage whitener/awhitener was turned off by me yesterday morning and it was good, was turned back on by me later and it was good for a while, but something turned off the digital quietly after that.
I wanted to see the guardian log but it's already in the maze of cryptic file names and it's a royal pain.
Turns out that when all WFS settings were reverted back yesterday evening (so that Den/Kiwamu/Evan can continue with full lock), 90MHz settings were also reverted back, including the whitening setting.