Epitek audio power module

One of my Epitek 5070 modules (70Vdc, 50 Watts) has the negative swing side open (probably due to a short on the speaker wire). Would you know where I can find one of these modules? I bought it back in the 70's and it worked fine up to now. It is not obvious where I can find one, even if I live near Ottawa where it used to be manufactured. I would not want having to scrap the Amplifier that I built based on these.

Thank you.

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