I have this digital dash in my W900 and it is so dim you can't see it during the day. I have replaced all three bulbs with the proper halogen bulbs to no avail. It brightness isn't affected by the dash dimmer switch. It had to be able to change brightness from day to night time. I know other kenworth owners have this same issue...but can't seem to find a solution.[
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I have only seen a couple of them apart, but from what I saw of them...
They are prone to dirt ingress getting behind the outer clear-plastic layer + discoloring over time.
As far as parts of the instrument cluster and gauges getting stuck in 'Night Mode', it is a common paccar-chassis issue. .. Disconnecting all of the truck batteries for about 30 mins to reset the cab controller completely, usually clears that issue up for a while.
This is a 1995 W900...no cab controller that I know of.
Can you recommend any one to possibly refurbish the cluster?
Is it LED or VFD? I don't know anything about it, but for years Nissan used VFD for their digital dashes and they had a pretty common problem where the power supply board solder would fail and the dash would no longer illuminate.