Thanks - I'll pull cluster and replace bulb. Just want to avoid that task if there might be other causes.

I know what you mean. Right after I cracked the bezel on my W140 coupe cluster I asked myself if the light bulb was worth it! It's funny how some come right out and others fight you all the way.

I'd replace the other bulbs while you've got the cluster out, for the $5 in bulbs why not do it all at once and not have to worry about it for years.

I just replaced several bulbs in my instrument cluster but I could not readily see how to replace the very small bulb behind the OAT LCD display. The bulb appears to be in a socket behind the printed circuit board that most likely drives the display, but there is no obvious way to get to the bulb. Does anyone know how to get to that bulb to replace it?
I have a 93 500SEL and was lucky; the cluster came out using the proper tools easily. Just an fyi.
Thanks for any info out there.

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1997 S600 Coupe
2002 Lexus SC430
2004 Lexus RX330 (wife's car)
Owned:
1993 500 SEL
1994 E320 (wife's car)
1987 300 SDL
1978 450 SEL
1980 300 TD (wife's car)
1969 280 SL