After removing the fan clean the discharge grille of any accumulated dust. Use a dry Q-tip or similar as compressed air may force dust further into the discharge grille.
Tip: During disassembly put the various screws into a clean, dry ice cube tray to keep them secure and separated by where they came from.
The fan discharges through a fine grille. When the fan is removed, one is sure to find this grille covered in dust. Using compressed air to blow out the dust could force it further into the grille. I used a dry Q-tip to remove the accumulated dust before installing the replacement fan.
On reassembly check that the PC card slot is properly lined up if you intend to use it. The eject button should pop out through the slot. I didn't think of this and found the card eject button was trapped in the IN position. That's fine with me because I don't use that slot and it was a nuisance that the eject button would pop out at the least touch.
The most challenging part of this and similar repair jobs is replacing the tiny Phillips screws. A fine pair of tweezers or needle-nosed pliers is needed unless one has the type of screwdriver that holds onto the screw heads.
I found that a #000 Phillips screwdriver was needed instead of a #00 for all those tiny screws. Great care is needed to avoid stripping the heads of the screws. When reassembling the computer, I recommend not tightening the screws fully, just enough so the heads don't protrude. After reassembly, with the screws not fully tightened, test that the computer works. If the computer doesn't work it will be easier to disassemble the computer again. If all is right give all the screws the final tightening but be careful not to overtighten.