Yes, the Centaur upper stage was and still is using balloon tanks.

I think this is the failure you're referring to: https://www.youtube.com/watch?v=imkdz63agHY

And here's a picture from ULA/Tony Bruno showing a Centaur tank in their factory, being supported by a rig: https://twitter.com/torybruno/status/1435553806792728579