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.