Issue:
The optique peter motor has been broken since run 21. It seems to be jammed because it was driven past the limit switch.
Serge:
Removing the motor and turning the leadscrew should help unjam it.
Matt:
It was stuck on the limit switch. There is a 2mm hex drive at the bottom of the linear drive shaft that is accessible through the bottom plate and the lens / mirror mount bracket. It took a bit more force than normal to drive it off the limit switch, but then it was easy to turn by hand. I put yellow labels around this access hole and taped a 2m hex key to the back of the unit. All the shims are removed and in a bag in the drawer below the unit. See attached pictures. Let me know if you have questions or comments.
