As I mentioned a few posts ago, I bought a kaput 700rbii off ebay for around £50 a few years ago.
I did a DIY fault check working front to back and established that the preamp and DI worked fine. Upon connecting a cheap speaker to the output I heard a loud thud through the speaker; I assume it's gone DC at the output.
Our local amp tech had a quick look and issued an I won't charge anything but cease and desist...he said the transformer is fine, keep it for spares. He felt that digging through the pcb wouldn't be cost effective compared to buying a second hand working amp.
A different repair company quoted me £150 to fix the amp presumably gone DC.
Obviously I was chuffed to drop on a new power amp module from Polar last week for £49. I now have 2 working 700rb amps.
So the dead module is free to anyone, would be good for a tech-y 700rb owner to cannibalise or fix.