Exactly the same thing happened to my wagon about two years ago. The left side was almost impossible to lower.
Took the car to the dealer and they said there was a defective linkage between the sensor which frees the seat lock (a small black sensor which is released when the door opens) and the seat locks. They fixed the linkage and the seat operated smoothly again.
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A. Rosich
CL 500, 1998 
S 500 L, 1998 
E 320 T, 1995  [Sadly sold  ]
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