What the

[EvilGav]

Wierd.

Looking through the Yamaha site, your flouro panel on the receiver appears to be displaying the same as the RXV-663.

I can partly understand the reason for this - manufacturers tend to have a single fluoro display that they use across the range (for example, if you look closely at your display, you can see the SB light between and faintly illuminated by the SL and SR lights - this light is only applicable on the RXV563).

Which suggests that what you actually have is either :

1. A short/mis-wire on the fluoro display, causing the SL and SR lights to illuminate the additional ones below them.

2. Yamaha use the same main-board in their amplifiers and for some reason the one used in yours has some of the EPROM's flashed with the wrong (higher) version, causing it to display the additional lights.

In all honesty, i'm leaning towards 1, due to the fact that the disks mentioned aren't actually encoded 7.1.