A request from a non member

[Refugee]

I don't think the resistor is part of the audio amplifier at all.
I would consider it more likely to be powering a regulator on one of the other circuit boards.
A typical audio amplifier of that type just does not have a resistor that size on it at all.
The only high power resistors are the emitter resistors and they are showing up on the photo of the amplifier and do not look burned.