I got the seat fixed! I bought a used seat base with the motor off eBay for $65 +/-. It helped me see how things were put together.

1. I removed the power control unit by taking out a Torx 10 screw located underneath toward the front. I used a hand mirror to find the screw, but the removal is done blind. Once the screw is out (took me about an hour and a few F-bombs), the unit snaps forward, then down.
   
2. There is a 13mm hex-head bolt on each side that holds the top and bottom pieces of the base together, each of which is partially under the side of the seat cushion. I bought a ratcheting 13mm wrench for $10 to get them out (took about an hour each, a few more F-bombs, and a trip to Menard's for the wrench). It took a little prying to get them out. Removing these two screws allows the front of the seat to tilt up about 6 inches.
   
3. With the extra room, I used a saws-all with a blade for metal to cut the aluminum crossbar that connects the motor to the gears that go into the side rails. That allows those gears to be pulled out of the side tracks.
   
4. Once the gears are removed, the seat moves freely, giving access to the four Torx 24 socket screws to remove the entire seat. From there it's fairly easy to replace the seat base and get the seat back in:
   
5. The seat belt has to be detached by removing a plastic cap and a 17mm hex-head screw. Pay attention to the order of the screw, washers and seat belt.
   
6. There are four wires to disconnect: 1 blue for the motor-to-power control; 1 orange and 2 black for the heater and seat-belt latch. There are 3 extra wires that are not used for the passenger seat; they are for when the seat is attached to the driver-side base.
   
7. The base is attached to the front of the seat by two plastic pieces that fit over a crossbar on the base that acts like a hinge pin. These are held in place by plastic pins/plugs that are hollow and have a small hole on one side. These act like expanders. There are a total of four, two for each plastic piece. I used pliers to wiggle them out (and a hammer to tap them back in during re-assembly). Then, the plastic pieces pry off with a flat-head screw driver. During re-assembly, the plastic pieces need to be fully in the holes before replacing the expander pins/plugs.
   
8. The rear is attached on each side with brass-colored screws that require a Torx 30 bit (I think).
   
9. The seat-belt latch is attached with a black Torx 30 bit (I think).

I had several left-over screws that may be what I had to remove from the old base to get it out but did not need for the new base.