Digam power amp schematics

Hello,

Does anyone in the Forum happen to have schematics for any of the series? I have a Digam 5000 here which has failed on one side. The main drive circuitry is enclosed in plastic. It may be possible to break the module open but I haven't tried.
The Italian manufacturers, Powersoft, refuse to part with any circuit information and insist that the only option is to return the unit to their factory for repair!
I would be grateful if anyone could help.