The game arrived at the show OK and was working fine during setup on Thursday.
On Friday morning the game was still working OK but shortly before the show opened it died. Initial inspection found the +5V missing, traced back to a blown 20A fuse F3 on the power brick. Replacing fuse F3 with 25A (apparently an Atari service bulletin upgraded F3 from 20A to 25A) brought the game back to life, but it was clear the fuse holder and power connectors were burned. One of the show medics had a new fuse block and the tools to replace the connector so we were able to properly fix it before the show opened.
The game ran OK for the duration of the show :)