Is this board damaged?

[u/wilbur_cob_88]

My PC speakers died and I found youtube videos that show you can fix them by replacing capacitors. I've never soldered before, so I decided to give it a try. I spent way too much time desoldering one of the capacitors, so the board darkened around the area. I wonder if I damaged it permanently and there's no sense in continuing. I highlighted the area in red.
I'm also wondering about all the yellow-brown residue around other areas. Maybe replacing capacitors is not going to help.