Potentiometers in the motors limit fore and aft travel. There are no microswitches on the rails. The micriswitch they are probably talking about is above the pivot point for the backrest. The switch tells the control unit to motor the seat foreward when the backrest is tilted foreward to get in the back seat. The problem is probably not the switch, but a broken spring thet attaches to a linkage that actuates the switch. The spring attaches at 1 end to a plastic lug, and the lug breaks off. When the spring is loose, the arm does not contact the switch, and all seat functions are inhibited. There is a TSB that details spring replacement, and attaching the end of the spring to a screw instead of the broken plastic lug.