I have restored one 1180C and 2 1152DC (similar). I never take out the Preamp assembly ( PJ00 ). I just take the main amp (P700), Relay and Peak assembly (PN00), and Filter amp assembly (PH00). I had no problem accessing all components on PJ00 without taking it out. That being said, I have seen here people taking out the PJ00 off the chassis.
Thank you, you are correct - I was able to easily pull the rods from the front.Leave it in place. No reason to take out. The rods come out easily from the front.
When in doubt just keep removing things.