In 2016, the source PC, EDID devices and the audio amplifier are housed in a new custom assembly mounted to the pegboard behind the video wall. Refer to the diagram below (shown with displays removed for reference):

The top of the bracket holding the assembly is installed in the pegboard about 12" from the bottom of the tv mounts:

The assembly is secured at the bottom with push clips in the pegboard:

To access the panel and work on the components inside, place your right hand under the center of the unit and release the latch bar on the left side with your left hand. It will slide down to service height below the bottom display. YOU MUST PLACE YOUR RIGHT HAND UNDER THE UNIT BEFORE RELEASING THE LATCH. IT WILL SLIDE VERY QUICKLY OTHERWISE AND DAMAGE COMPONENTS AND CABLING.
Once the panel is slid all the way into service position, you can take your right hand off the panel and begin work.
When sliding the panel down and up, pay special attention to all the attached cabling to ensure that nothing comes unplugged.

Inside the device, you will be able to see and service all the components of the showcase wall:

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