I finished this job a while back, but thought I’d report on what I did. I ended up removing that long through bolt. That allowed the support frame to swivel down and just enough out of the way that I could get tools and my hand up in to loosen the bolts for the servo motor.

The bottom two bolts were easy, but I had to use a universal joint and get at the top two bolts completely blind. The same was true for getting everything back together.