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Is your C140 equipped with orthopedic seats option?
My S 500 L comes with the othopedic seats option and if all switches are set to the highest level the seat back feels harder than a rock.
Maybe the dealer did something to the system that even if everything is set at "0" you are getting full air pressure on the seat back.
Just a thougt...
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A. Rosich
CL 500, 1998 
S 500 L, 1998 
E 320 T, 1995  [Sadly sold  ]
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