Questions about raid info and lockouts

I’m farming old raids/dungeons… and of course running into issues with raid lockouts. I am confused by which ones I can still do…

if I press O and go to raid info, and for example Kara says it’s “expired” but then has Attumen as being “defeated” does that mean I can go back and kill him again or does that mean he’s still down?

If the raid is expired you can go back in and re clear all the boss’s.

Showing you what boss’s are still up is more relevant towards extending your lockouts for raids. When you zone into an instance without extending and it is expired you will default be in a new fresh instance