The power seat on the drivers side will not move up or down, all other positions work fine.
The motor and switch seem to be working but I hear a grinding/clicking noise under the seat when switching up or down.

Take a look at the link below; it should help you with the procedure to address the seat issue. If you have additional questions, feel free to post a Comment just below the article and one of our techs will get back to you with more details. Best of luck!

Seat Adjustment Switch Repair and Replacement

The switch is bad or dirty. Probably the latter. Take it apart snd spray it with brake kleen or electrical cleaner. They're both the same ingredients. If that doesn't work, the switch is bad all together. The grinding noise could be something in the track. Make sure there isn't change Binding it up.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Thanks Jake, I will check it out!