To remove the wiring near the mains input socket, lift up the black & white cables over the retaining clip.

Pull the earth cable down from underneath its retaining clip.

Repeat this for each cable restraint along the cable route at the bottom of the printer.

De-route the wiring from the power supply board down to the power switch.

Sliding the ferrite bead (picture 3) towards the top of the power cable frees up more cable to make de-routing the vertical part easier.