Anthony Kouttron sent me this useful information:
I have been repairing lumix Gh series cameras for several years now, but something I have been noticing with the GH3 and GH4 cameras is the failure of the LCD hinge cap. They crack over time from just normal use. panasonic does not sell these parts leaving your camera lcd cable exposed to damage. I CADed up this hinge cap for free for someone to download and print. I made a guide here. It is a guide on ifixit, so the images and media are under a creative commons license. Feel free to link it!
https://www.ifixit.com/Guide/Panasonic+Lumix+DMC-GH3+LCD+Hinge+Cover+Replacement/108291
Thanks Anthony!