That's the last power rail alive.
I'll do another sweep later on and do full ripple characterization under load of each rail (I spot checked for obvious problems but that was with no firmware on any of the chips except the supervisor)
On the DAC front, U21's output is still flatlined (IN0-IN7).
But I'm seeing the expected 500 mV on the outputs of U22 (IN8-IN11 plus the CDR trigger input).
So with a few bitstream changes, I should be good to go test the trigger inputs on channels 8-11.