I would start out by checking all the voltages from the regulators. I would then look into the relays and associated circuit for the mute. After that it's any ones guess. I would say there is a better chance of something physically failing than a solid state component failure.
I can hold my own;)
It was a toss up for the first three. I wish Lacuna Coil would have performed longer. Disturbed was actually really good but they took up most of the time.
Disturbed/Lacuna Coil/Killswitch Engaged/Chimera two weeks ago. Sprained my left ankle while catching a breather from the mosh pit. Caught a crappy cold while waiting in the emergency room on base to get and X-ray. Just now getting over the cold. Ankle is still fucked.
Avenged Sevenfold/Buckcherry next week.