There are three motors and three cables for these seats. If necessary, removing the seat is not difficult (four 10mm nuts and a cable harness) but you might need a helper to help lift it out of the car. Once on a bench, you can easily access the motors and cables. But if the seat does not go forward/reverse, getting to the mounting nuts is a b**ch

However, it is easier to check the switches first, if the front of the seat goes up, the front up and down motor is fine, if it goes back, the forward and back motor is good, etc. and you just need to clean the switch contacts.

Good luck

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1939 170 - till I was 3, still turns heads
1989 300TE - daily driver has 263k
1987 300E - purrs happily with 120k
1983 300SD - keeps my friend happy