[HETPE3B]

Thanks so much for a detailed answers!
I never realized, that there are DIC and non-DIC clusters for those vehicles (Silverado, Tahoe, Avalanche). I knew there were Trailblazers and Envoys with DIC and without by simply looking onto the lower display (big or small).
I guess the first option from the 6th question indicate cluster without a DIC and 2nd and 3rd indicates the cluster with DIC?
Does the same cluster part number (on the sticker on the back) may have versions with DIC and without or it is always properly refers to the one or another?
Can the cluster without DIC work properly (without DIC functions of course) in the car with DIC and vise versa or any warning lights may come on?
Regarding the language scroll problem I did personally saw (and fixed) a handful of times the cluster with a broken button with a language scroll problem. The button simply fall apart inside the cluster and metal spring was making the shirt circuit.
I was suspecting the rust on the circuit board could be the culprit for language scroll and I always remove it and they use some anti-oxidation solution, but it doesn't always seem to help to fix the problem so I wasn't aware if it was the coincidence or real fix. Sometimes oxidation removal didn't help to fix the scroll problem at all.