I accidentally transposed the numbers on the model number of my previous post. This is the correct model number STR-DE 435. I turned the unit on the other day after nearly 10 years of flawless operation and after a few seconds "PROTECTOR" began flashing in the display. Nothing I did worked to alleviate the problem - trying the remote, attempting to use the "setup" menu, unplugging the unit, nothing. I have the owner's manual and it makes no reference to this problem at all. Help?