C Class LCD display problem

My 2000 c-kompressor has a problem with the yellow digital display where some of the numerals are either faded or had disappeared. The display is better on some days than othere but there's no identified reason as to
why. How do I rectify this?
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http://www.mbclub.co.uk/forums/showthread.php?t 604&page=2&highlight=cluster+ribbon
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