2005 1500 4x4 Instrument Cluster Light Issue

[ABlo22]

I have a 2005 ram 1500 5.7 hemi with a manual floor shifter for 4wheel drive. Ever since I have had it the 4WD light has never come on on the dashboard even when engaged. The 4WD works perfectly in every mode. I ran a C Code test on the dashboard and every light lit up EXCEPT for the SERV 4WD light which leads me to think is the light is burnt out instead of the more common sensor issue. Is there a specific bulb for that light and if so what is it? Is it even possible to replace or do I have to replace the whole dash? Thanks!
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[kevkev]

Its your sensor on top of the transfer case. They are notorious for failing.