When re-assembling everything, before performing step 27, it is very useful to perform part of step 23 *first*. Specifically:
- carefully replace the small DC-in boardand secure with the two 7 mm Phillips screws (step 23 yellow)
The small DC-in board is *much* easier to set in place and screw in if you do it before screwing the logic board back in place.
Correction about length of screws. The picture implies that the 3.5mm screw (orange) is the one on the right, nearest the USB ports etc. In fact it is the one on the left, nearest the fan.
When re-assembling everything, it is much easier to perform steps 15 & 16 before performing step 25!