the 7.5 is ok at the transformer end but 2.2 is a worry. They should both be at about the same voltage at the transformer end and at the power supply G.I. input. The G.I circuit comes out of the transformer on 4 wires and goes into the power supply as 4. But the first thing that happens on the power supply board is both yellow wires connect together and the 2 white wires connect together. The yellow goes through the relay on the pwr supply board then goes out on CN8 pins 1 to 4 to the G.I. lamps. The 2 white wires go straight to CN8 on the pwr supp board pins 6 to 9, then to the fuses on the PPB board.

I would like you to look at the attached picture and let me know the voltages between the following wires .
Y1 & W1
Y2 & W2
Y3 & W3
Y4 & W4.
Next I would lke you to unplug CN9 at the power supply. (with the machine turned off) and test the above again.

Once I know these voltages then i will give you some more instructions