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

Problem Description and Possible Solution
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.
Problem Data
RepairPal Verified
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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Horizontal lines in display screen. Several buttons do not work including EC. Am unable to run system without compressor engaged.