Buttons on temperature control assemblies work erratically due to wear of parts in control head on Mercedes-Benz S500

Due to wear of mechanical parts in the control head, the buttons on temperature control assemblies work erratically or not at all. These control heads need to be replaced for this concern or when the display screen starts to fade out.
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Average mileage: 131,500 (93,000–170,000)
7 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2006
9 people reported this problem
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2001 Mercedes-Benz S500 93,000 mi,
Horizontal lines in display screen. Several buttons do not work including EC. Am unable to run system without compressor engaged.