This re-install of the clip was surprisingly pesky, I agree. The AC-in socket wanted to sit too far towards the edge of the case, so the retaining clip couldn't be slipped on far enough to close fully around it. I had to push the AC socket to the left while sliding the clip to the right until the wings were really securely closed.
Cable looked to have been glued down with just a spot of RTV (silicone.) Easy enough to peel slowly with spudger. Ordinary RTV is corrosive to electronics so if you add fresh, make sure it's electronic-safe. I also reinforced the black tape on re-assembly with a strip of Kapton tape, and burnished well with spudger.
Screws have loctite residue. I put a tiny drop of fresh blue (semi-permanent) on each screw before reinstalling.
When re-installing drive tray, note two holes in tray engage two spuds at the far end. I fumbled with this for a minute.
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