Use a plastic spudger to release the white adhesive between the ribbon cable and control board. Remove and set aside the bearing if it is on the shaft.

Flip up the two brown lock tabs on the cable connection points. Then slide the cable free.

If your arm is still attached to the shaft, use a 1.5mm Hex bit/wrench to loosen the set screw at the shaft. Slide the arm assembly free of the shaft. You will now want to inspect your control board for physical damage.