Coincidently, I am currently having the same problem on my HSII.
Would it be too confusing for me to jump in on this thread, or should I start another?
When pressing start button during single lamp test, info says the pins are 134 pin 9 (red/grey) and 137 pin 6 (yellow/blue) although my red/grey is at 135 pin 9 and yellow/blue is at 138 pin 6.
I believe this is OK. Am I correct?
I also see that the red wire passes through the coin board. Thanks. Sparky