Howdy guys, so I am finally getting to addressing the castle lock optos. I started by using the BSD Shop Guide that is somewhere here on Pinside, and then I realized after getting on the middle of page 2 that all I had to do was remove the bolts on the right slingshot plastic that are responsible for holding the end of the long ramp in place. Reference pictures below:
The bolts that go in here are pretty much all you have to remove. From there, you can use a stubby philips head screwdriver and remove the two bolts holding the hard castle plastic in place. Once that's removed, you can clearly see the castle lock optos:
I am pretty sure, per PinballLife's page, that the transmitters are the white components.
So right now my locks engage in the order 2 --> 1 --> 3, so I am going to switch the first two transmitters and see what happens. I'll keep everyone in the loop - should hopefully be done with this *gulp* soon!!