Ok, so I bought this Vox AC30CCH a few years back. It has played wonderfully for most of that time (except certain problems with the effects loop at one point). Well I popped it open to pull the recently bad Power Tubes out and I noticed something out of the ordinary. I know people sometimes mod their amps. But I have no idea where to start with how to figure out what mod was done here. And who knows. Maybe it just needed a new resistor in that spot for some reason so its the same value. But I dont know. Could anyone figure out what was done according to these photos? Its just on the main board that you see when you pop the back off if that helps. Not the one with the pre-amp tubes mounted on it. Anyway, any info would be great.