Q8 problems..?

My Cambridge A3i has finaly packed up.
Ive read its due to a last minute change in power to increase the output.
This apparently fried LED2 & Q8.. whatever that was.
Its lasted me about 12 years. It always used to overheat, then the inbuilt protection circuit used to cut the output for a few minutes till it cooled...
which meant i had to turn the volume down.
I left it on for a few days last week by mistake.... & it went thump thump bang...!!!
There are a few frazzled looking transistors way over to the right of Q8.... but most of the rear of the PCB looks baked... so.. Time for a new AMP.