Also go into switch edge test and make sure that switch does not show as closed.

Q71 would be the left slingshot. Q75 is the left popper.

Does the left slingshot work?

I would run the tests again. Some of those transistor cases look a little corroded so scratch a little bit with your probe to make sure you've got a good reading.

Ground is switched rather than hot. Have a look at the input to Q75 with a meter and compare to one of the other driver transistors. Do the test grumpy suggested.