The countdown for the Wet Dress Rehearsal (WDR) started on Saturday, ran smoothly until about 15 minutes ago when they halted the WDR at T-5:15 due to a hydrogen leak.
The goal had been to get down to T-0:33 which is where the Ground Launch Sequencer takes over from any human interaction, then recycle back to T-10:00 and repeat.
After several hours of built in hold at T-10:00 the first time with a fully fueled rocket, while the close out crew tested systems in the capsule and then closed all of the doors, the terminal count started and proceed to just before the 5 minute mark. At that point the WDR was terminated.
They are now unloading the fuel.