Spooney 10+ year member
CarAudio.com Veteran
After looking a bit closer it looks like corrosion of some sort to me more than a burn. It worries me a bit because of the proximity to those capacitors. If that is electrolyte that has leaked out of those caps it is very corrosive and needs to be cleaned off of the board before it eats through it . Also if it is indeed electrolyte that has leaked out of those caps I would probably replace all of them that are in parallel with the one or ones that have leaked. Could just be something different though. Real hard to tell from the pic.