So just thinking a bit more about john's info above.

Does this mean if for example one string was out due to a board issue, and there were other spare pins on the plug not being used (as not all machines have the same no. of GI stings), that you could swap them across

EG: Pins 1 and 7 had no voltage

Pins 3 and 9 were blank - move the br and br/white wires to these ones and it should work?

Just an idea to get out of a tight spot.