Sent the ts480 in to be fixed. It locked in Transmit. Nothing
except powering off the radio solved the problem.
Well, I had put the radio on it's side, to save space. I had the top
of the radio pressed against the side of a cabinet. I didn't realize
that the top had a vent above the controller board.
Well, the moisture in the basement corroded the board. It has to be
replaced, for a cost of $400.
So my advice, don't do that.