I was thinking of you maybe contacting Clive Button , one of the designers of trace amps back in the day, but i see you've had some good advice from Old Horsey.
Then again, from my conversations with Clive when i was asking him about my GP11 Mk 5 combo, i believe he said he didnt design those models, or earlier, so maybe he came into the designs at the Mk 6, which i guess is no good to you either, if yours is an early model.
Clive was helpful though in other ways. I was asking him about stuffing in a bigger amp and he said it wouldnt be problem, as the speakers in my 4x10 combo could take a lot more than the amps were rated at giving out