Thnak you all for the replies.
I am lost about where to connect the load to the +5Vlamp rail.
As far as I can make sense of the schematics the pin 10 of P1482 is connected to ground.
According to Ozan's reply (and the schematics...) the output to the mainframe of +5Vlamp is on P1417 pins 3 and 4.
So, I will need to make another flat cable to connect the dummy load to P1417 and the +5Vlamp resistor load should be connected between P1482 pin 10 and P1417 pins 3 and 4.
Is this correct?
Thank you
