Thank you for the detailed guide. The previous owner of my used 2014 i3 must have enjoyed commuting with coffee, because the iDrive switches had a gummy resistance.
Once apart it took quite a while to clean all the dried gunk and debris from under the iDrive, inside the console, and around the switches. Thankfully the mechanism is well sealed, and now that it is cleaned, operates smoothly and effortlessly.
I would not have attempted this with this guidance.
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