My paper version for the 400 is missing the last output transistor buletin. I just repaired what must have been the last 400 biult. It has the fiberglass series II driverboard, a speaker relay, input volume controls ala the 700. But what is interesting is the outputs are all labeled 126-00073, which must be a part number Phase Linear assigned after that last bulletin was written. Also stock in this unit were bias transistors ECG192A. Predrivers were 2N5415 and 2N3440.