Rich,
You'll find that the fan motor is a circuit unto itself. The motor
itself is brushless and has several Hall-effect sensors inside for
input to the drive circuitry. I've replaced motors before, and it
isn't too bad. Step 1: Clip the motor leads close to the board
before desoldering so that they don't get in the way of your
desoldering tool. Step 2: Make sure your solder sucker has LOTS of
hard suction. Relube the o-ring inside with silicone grease if
necessary.
Dean
