Following a pretty severe lightning storm, my 82TXS receiver is acting a bit weird. It powers up and video menu functions seem to work (though it won't pass video), none of the audio information comes up on the display. None of the audio feature controls have any effect. It won't pass audio either. I've tried resetting the unit from the front panel and I've unplugged it a few times, but nothing changes. All that displays is the source. Is it toast?