HC 2000 power amp

[amptech]

This amp came in with dead fault.. But it does power up and all relays click as normal but it's in mute mode!!!

There's not much info about these amps only there made by rcf at 1k per side.
Does Any one have schematic for this amplifier..

Thanks for now..

 

[amptech]

It may be a case of trace the circuit out...