About the digitizer connector: its flat cable is so short that the when I attempted to seat the next connector, its flat cable pressed on the digitizer cable, which can pull on the connector and dislodge it. That happened several times for me before success.

Robert Bernard 27 Nov 19

I don't understand why the PC Card Cage, whatever that is in this space, is involved with the secondary fan. That fan, or its placeholder in the case of the 667mHz, is at the far right over at the right just next to the DV in board. Please advise. RHBernard@gmail.com

The logic board in in contact with the flat plate that shows in the lower center of the following picture. The black stuff is thermal compound, that increases heat transfer from the microprocessor chip and the heat sink. The irregular area is where the bond of the old compound has broken as the logic board was released in step 28.

It is extremely important that the old thermal compound is removed throughly removed from the heat sink plate and from the contact area of the processor chip, and that new compound is applied to the processor just before the logic board is replaces of a new one installed in its place. You can obtain from iFixit a small tube of Arctic Silver heat sink compound together with a bottle of ArctiClean solvent that softens the hardened compound, and an accompanying bottle of Suface Purifier.