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GMT800 01 Tahoe 6 way seat motor runs but no movement of bolster

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My driver's seat bolster stopped moving.  I can hear the motor whining, and the the 4-way dial still operates the vertical lumbar support fine.  It's the horizontal supports that move in/out from the sides of your torso that I'm talking about.  Any suggestions on a fix? I've read gently that this could be some type of stripped plastic gearing assembly, or similar plastic guides like a window regulator.  Has anyone replaced the offending components with success?  Please help.  Thanks!

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