Actually, J3-2&3 should be at the same DC potential as they just loop through the Final. The signal originates from Controller board A2, J10-5 which traces back to IC1, pin 45. In my service manual that is marked 0V which is essentially what I have. So, unless that DC signal is supposed to change on TX, this is another dead end. Also noteworthy, if I do nothing else other than extract the pin for the blue wire from J2-2 which is the -5V power buss, with everything else connected, I get full power from the rig. But, the SWR meter is still pegged.