Problems with my Pioneer VSX-D812?

I need to reassign the optical inputs in my reciever. Somehow they got changed. The manual says I can access that by phessing "Receiver" on the remote, the unit should power up and I should be able to make those changes. Pressing that button on the remote does nothing. Every other function works, I can't find anyway to do this from the front panel. I have unplugged it, doen a factory reset, still no luck. Anyone have any ideas? It works fine, just has the optical inputs assigned wrong.