From the new, unpublished, FAQ:

Caution. Disconnect the negative
battery terminal in order not to take any chances with the SRS system. There
is a sensor under the seat.

Won't Travel in One Direction.
[Query:]  In my 960, the passenger side 8-way powered seat works in all
directions except down in front.  [Response: Mike Froebel] You have a dirty
switch.  I have had good luck carefully prying out the rocker part - the
part you move with your fingers.  Pry that plastic out from the front or
rear.  Once again, be careful, there is 6 small parts in every switch. 
Clean all electrical contacts by scraping with a dull knife, and get all the
sandwich crumbs out.  Grease the 2 balls (also helps to hold everything
together) and snap it back in place.  You may also have a broken solder
joint where the bottom of the switch is soldered to the circiut board. 
You have to take the assembly out to do this.  There are 2 bolts holding
it in from the bottom. Either way you should be able to fix it for no money.

Seat Back Jammed. [Tip from
Don Willson:] On a trip last week the seat back quit working on one side. So
I clipped the hog rings at the bottom of the seat and pulled the upholstry up
like pulling off a sweater until I could get to the flexible cables. After quite
a bit of investigating I figured that the motor and gear boxes were OK. I finally
decided that the flexible shaft inside the housing to the inner gear box was
too short and had slipped out of the gear box toward the motor end. Since I
could not stretch the cable I shortened the housing about 3/8 inch and reassembled
it and it works fine.To synchronize both gear boxes leave one unconnected and
move the other side back and forth until it is about in the middle of the travel
with the other side not moving, then reconnect the loose side.

Cable Failure on One Side.
[Query] My drivers power seat will not move forward or backward on one of the
rails. This causes the seat to twist rather than move forward/backward. [Response:
DanR/Bob] The same motor drives both sides via cables from each end; these in
turn move each side of the seat. What happened on my seat was that the inner
cable's end had rounded out on one side. The cables are round except for the
last few inches where they are square. The square ends fit into the motor shaft
and the gear on the track gear box. It seemed that the inner cable should have
been longer than it was as just the last 1/8 inch was making it into the gear
housing on the track. Many folks have repaired this by making the outer sheathing
shorter to get more of the inner cable to seat into the gear housing. I didn't
see any way of getting the metal sheath off the cable without destroying the
ends. So I left it alone, all I did was insert 1/4 inch piece of round steel
in the inside of the motor shaft to push the cable through the sheath further
into the gear housing.