OK, that is good. The PWB should be long gone.
(It also explains why you keep referring to the 12p connector.)
That connector is tough to test without actually pinning through the insulated wires.
Pins 1 & 12 are 72v input
Pins 2 & 11 are not used.
Pins 4, 5, 6 are -12v output and connected to ChassGnd.
Pins 9 &10 are +12v continuous.
Pins 7 & 8 are +12v Switched (when Pin 3 sees 12v on it)