Trying to get my pins fully up and running before Thanksgiving (two sys 11s and a sys 9). One of my system 11 power supplies refuses to keep 5V consistently- sometimes it works for a couple of hours then stops; other times I fire it up and the 5V is missing entirely from the get go. I know its this board because the gripe follows the board when I swap it to the other sys 11 machine. C8, C12, and C10 are new within the past year- I've never heard or read of the IC or the transistor going bad, so I'm hesitant to troubleshoot by swapping those out. What am I missing? Could it be C15? The fact that sometimes it has 5V and eventually doesn't, and other times it doesnt have it at all makes me think it is most likely a capacitor and not the chip or transistor.