HH S500D Schematic

Hi,

I have a HH S500D which is getting a bit long in the tooth and could probably do with some TLC. It plays music okay at ~half power for around 90 minutes and then progressively sounds distorted.

Please could someone point me in the direction of a schematic for this amp, particularly the AS00008 O/P Driver PCB. I have searched threads on diyAudio and the wider internet, so have the chassis wiring & O/P Module details. Would like to be ready armed before poking around inside.

Many thanks

Dave