My OG xbox wont turn on. Not a single bulging or leaky cap. I was going to replace all the caps but I noticed this and I dont know what it is, how to tell if its bad or how to order a new one. It looks kinda burned on the top but it just appears to be the rubber and not the part itself. is there a way to check it with a multi meter. The part I am asking about is the one in the first picture