The name of a specific texture in TF2?

Hello! Long story short I’ve been modding my TF2 with skins and sounds and I’d like to make my own. I want to alter a picture from the team selection menu but I have no idea what the texture is called or where it’s located… I looked through the .vpk’s in Team Fortress 2/tf but I couldn’t find it anywhere. It’s when a team has more players than the other and when you try and click on that door you see the man with a red circle around him and the slash through it. All I’m wondering is, what is that texture called? And where in the world is it? Any help would be appreciated, I wasn’t sure where to post this but I hope that here is acceptable.

I don’t remember the name, but I know the team selection menu isn’t a flat backdrop, it’s actually a model or a collection of them. I figured this out while flipping through tf2 content in sandbox. That being the case, what you’re after may actually be comprised of more than one texture. Hope this helps.

Edit: Each of these was found in tf/models/
ui_arena01
ui_arenadoor01
ui_class01
ui_deathcam
ui_team01
ui_team01_blue
ui_team01_random
ui_team01_red
ui_team01_spectate
ui_welcome_01
ui_welcome_01_screen

you may find textures with similar names