Hi Kieran,
The YouTube videos that I've seen covering the Hudl2 tend to skip the actuall opening of the device, but [https://youtu.be/UpaFXi2kbKc?t=20s|this video|new_window=true] gives you an idea of how the rear comes apart from the rest of the device. I'd recommend using a plastic opening tool to work your way around the seam. Also, since nobody else has created a guide for the Hudl2, feel free to document the process and create your own guide.
I hope this helps. Hopefully, it is just a loose cable.