Memphis Audio 16-MCD500 part identification

I installed the new transistors in the output section. I have a perfect 40hrz sine wave on the output inductor that fluctuates with the gain pot. The relay is not engading so it not at the speaker terminals.
Is there a way to just bypass the relay?
 
It's mine for practice perry. Taking on more difficult repairs, just teaching myself. I would like it work as intended. What makes it engadge? A certain voltage? I changed q91-92 for good measure. I would like to know how it works and why? And how to bypass it if need be.