Power Seat on 2005 Chevrolet Silverado 1500

the driver side power seat on my truck has a problem.... one side of the rail system will slide but the other side will not.... fuses have been checked and they are good... do i need to replace the rail system or is there a motor that just needs to be replaced?

Asked by for the 2005 Chevrolet Silverado 1500
Sounds like only one gear set is working, so only one side of the seat is moving. What I do, is I take out the whole seat and put it on the ground, upside down, then I use a battery to move the seat and look at what is binding or not working. It is pain, but I fix a lot of seats, 'really right' the first time.
i have found out its the one motor that isnt working any ideas on where i can find another to get replaced?