It would appear Q1 is likely bad given those readings. Whenever in doubt, I always like to compare readings on similar nearby components, so if you're getting a different reading on Q1 than the others nearby, I think that supports Q1 being bad. I know in some cases when a coil driver transistor goes bad, it can sometimes damage the other transistors in the same circuit.
It's also possible the diode on the coil might be damaged. (if the diodes are on the coils, sometimes the diodes are on the boards instead...) If the coil has a diode, I would recommend replacing it before turning the game on with the new transistor. Make sure to wire it correctly with respect to the banded side of the diode. Take pics before you replace it for reference, or ask for help if unsure--you need to make sure it's wired correctly or you'll just damage the new transistor(s) and possibly the coil too.
DumbAss makes a good point, Rottendog is not the same design as the original CPU. Troubleshooting it may require their assistance if there's still trouble after trying what can be done.
One other thing that should be mentioned here is that the ripper is a "switch triggered solenoid" meaning there's 2 ways for it to be activated--one way is for the CPU to fire the coil in the coil test and the other way is tied to the switch in front of the ripper that the ball rolls over. I would get a good look at that switch and make sure nothing is shorted/miswired there. Might not be anything wrong with that switch, but I would def get a look at it during this process.