So this worked, uh? That's good news because I'm nearly positive I'm having the exact same issue. I don't exactly understand the screwdriver arrangement but I do have my lens off via the paper clip method and the lens is functioning beautifully. Now, the shutter cocking lever and mirror are what is frustrating me. The shutter cock lever is stuck in the vertical position and the mirror is locked up. Tomorrow I'd like to attempt taking of the side panel and having a look inside. Questions however; I have Pro S, will this be a much different process than with the older model? I will for certain need to replace the light seals afterwards? I'm hoping this task isn't so difficult to where I won't be able to piece it back together... Maybe I'll film the process just to make sure.
I look forward to hearing your thoughts, fellas. Thanks a lot.