Thanks heaps guys - prob solved, below is the process

Followed shanstas advice above, triple checked continuities - and still all OK

Then sent to the GI test and noticed that the lower pf GI test illuminated the upper pf and got me thinking there might be some screwy wiring (as the 120/121 had already been replugged before i had the machine, then i just replugged again to make sure, and put the wires back where they had been)

Decided to look in the manual at the wire colours for 120/121 and 120 was all out (ie: wires at every 2nd pin, when they should be in two groups of three), re pinned the plugs to the appropriate wires and all the GI works now.

Thanks heaps for your help as i now know how to test AC properly as well as understand GI circuits a bit which was always something i was very shakey on.

Right, off to get that elusive Vacation Jackpot that i still haven't got!!