HP/Agilent/Keysight 3631A Power Supply Mains Connection

[SparkFly]

Dear All,

I've had to take apart a 3631a supply, and foolishly my teardown pictures aren't clear enough for me to be 100% sure as to which jumpers the mains input wires go. I've consulted the manual, and looked online at others pictures, but they're just as cryptic. Would anyone be able to tell me whether the mains connections (ie the blue and brown from the mains direct) goes to J12 (with the back of the supply facing you, the left jumper) or J13 (the right). The other pair of blue/brown will go into the other jumper.

Many thanks for any help you can give.

SF