Trouble with Peavey Backstage 110 amp

[Protech]

I'm not sure if i have a problem with the finals transistor 70483100 and 70473100 ? I have a high feedback noise (not a hum) and the transistors heaten too much. The protection open and the amp shut down. It's seem to have leaking current from the pre-driver or the finals ????
Someone know the problem ??