Mine has all of a sudden gone dim

It still works and I can see it, but it used to be as bright as my digital odometer. I had a guy put an analyzer on the car for my notorious cruise control problem (many posts, no fix) and when I got it back it was dim????
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Coast Aero Support Services, LLC
'92 MB 500 SL
'01 BMW 525i Sport
'98 Harley Davidson RoadKing
'74 BMW 3.0 CSi - Gone to a good home