LE replaced, channels back up.
This isn't to say there aren't still problems tuning QAM channels here in 'Vegas. I still have to restart this 7400 once a day to insure programs get recorded, otherwise I get the yellow 'Exclamation Mark' signifying the unit couldn't tune that particular channel at that particular time.
I'm also still experiencing random sluggishness of remote control response. it's to be expected I suppose during the 3 minutes per hour it spends updating the Premium Guide, but I get it at other random inexplicable moments as well. Real annoying.
Fingers crossed that Isaac and Joe and the engineers are still diligently at work on solutions.