First of all, there where about 5 or 6 versions of this amp.
You have to be sure that the schematic that you have is correct.
The Crown service manual walks you through what ground connections to make if the board is removed from the chassis.
If you do not have the SM, go to Crown's site & get it.
I am confused as to how the Ch1 output transistors can have no reading.
The collectors of the NPN (MJ21194) transistors are connected to the +85 volt rail. So a reading can be had on the case.
The emitters of the PNP transistors are on the -85 volt rail. A reading here will require that you flip the board over.
What skill level do you have?
These amps are a real challenge to repair.
The board is a real pain to remove from the chassis.
Most of the components are surface mount.