Okay, the issue IS apparently related to the noises I mentioned earlier on: a noise described as "chattering" on the Atlas V's upper stage coming from an oxygen relief valve.
@skrishna Aside from PSV mechanical failure or spring setpoint error, a plausible cause of PSV chattering would be refrigeration failure of the liquid oxygen tanks causing excessive pressure. I wonder what the pressure readings were.
It's not clear why we scrubbed — priority right now is getting the crew out of the capsule. But it sounds like an issue with the ULA Atlas V rocket, not the capsule.
Suni's gross leak checks on her suit are complete, and it looks like they were troubleshooting some comm issues between Suni and Houston but they've been resolved
So far everything is going very smoothly. Which I am honestly not surprised by. This is a known launch vehicle (as opposed to SLS for the Artemis I launch) and they have tested and retested every inch of this spacecraft.
@pewnack It's very easy to take a screenshot and say someone looks stressed out. I've watched them at press conferences and events all week. I believe they are comfortable with the spacecraft.