Am I wrong about this, or isn't it by design that some of the idiot lights are dim and some are bright? Can't remember offhand where I saw that, but it seems like it was in the FSM. That doesn't mean that the OP's bulbs aren't dimmer than they should be and would benefit from being replaced when the cluster is out.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't