hifi engine

wanted: service manual / schematic of Sansui SE-3000 Stereo Graphic Equalizer

I have a Sansui SE-3000 Stereo Graphic Equalizer which I need to repair.
The previous owner identified the fault to be a broken transistor, he removed it, but did not note the type of the transistor. So I need the schematic or the service manual to be able to find a suitable replacement transistor so I can repair my unit.

Thanks in advance,
regards,
Hans