Button Control Cables
Remove this to detach or remove circuit board (see next image)
Unscrew this to detach or remove circuit board (see next image)
Stop / Repeat / Return cabling
You will also need to detach this to access behind the circuit board.
If the arm is not traversing properly, or not at all, the usual solution is to change the arm belt.
If this has been 'greased' best thing is to remove it. I have used WD40 dry PTFE lubrication.
Circuit Board Screw
Despite the additional holes for screws, only one is used to hold the circuit board in place.
Latest update: 09.02.2018 - Thank you all "feedbackers"...