The electric driver's seat on my 2000 Ford Explorer will move up and down and forward, but not back. There was a time when I could put pressurer on the panel while moving the switch and have the seat move, but this no longer works.
the switch has failed or a combination of the switch and motor. the switch will be the easiest to replaace as you will have to remove and on some vehicle partially disassemble the seat to do the motor. The switch os mounted on the plastic panel which is held to the seat usually by 2 - 4 screws.