Overvoltage repair

Hello, I have a T.Amp D3400 and it was exposed to an overvoltage past week, where a Varistor blew up, but now I already change it and when I try to connect it to the power supply, my circuit breakers shuts down even when the power amp is Off. So what I'm asking here is, in these cases of Overvoltage in Power amps what should I check to see if it's still working? All the fuses are all right, and I think it might be another Varistor (the system has several of them), but I don't know how to test them without taking them off the board... Another thing is I can't find a schematic of the amp so I can show you which varistor blew up, but if you need something like pics just say. Thank you for your help