Buttons on temperature control assemblies work erratically due to wear of parts in control head on Mercedes-Benz 300CE

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: (–)
4 model years affected: 1990, 1991, 1992, 1993 more
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