IT HAPPENED AGAIN!!
This morning I turned on my replacement RX-515V, and it sounded
suspiciously low. I pressed "Test" for the surround sound pink
noise, and sure enough, center channel dead.
It seems these receivers have a history of blowing center
channel outputs. And no, I'm not over-driving it. Even JVC
themselves no longer service 20 year old receivers. They
can't even look up this model number!