There is one group of wires located towards the front of the case and attached directly to the motherboard and the case. Using two fingers in a pinching motion, release the wire from the clip and disconnect it.
There is one wire connecting the fan to the motherboard that must be unplugged in order to release it. To unplug, use your fingers to pinch the white clip at the end and gently pull upwards to release.
The motherboard is in the middle of the device and has all wires and connections of the device components running to it. The fan identified as fan A is located on top of it and must be removed first.
Two outer 8.1mm screws located above the HDMI ports hold the motherboard in place and must be removed. Remove these with a #1 Phillips head screwdriver.