Did you ever find the schematic? I’m having a problem with my relay. It won’t energize and come out of protection. There is dc offset on both channels and I don’t know how to adjust.
First of all kudo's with regards to your UN, Zappa references are few and far here.
2nd of all the poster you quoted and asked a question of posted that 13 years ago and other then updating his/her profile earlier this month hasn't posted in 9 years.