Well your question is somewhat paradoxical as MB won't address a problem unless it happens. If you mean subtle signs of failure, I had a rear differential leak that was spotted by my local shop when performing an "A" service at 50K (I have a certified pre-owned so warranty is to 100K or 5 years).
Then there are the usual plethora of warning messages and other issues that are well documented on the Forum such as chattering brakes with low mileage, limp mode, shaking mirrors, squeaks and rattles, etc. But again the point I am making is if they are not happening now, there is nothing to fix. The only thing that they will fix for you if something ain't broken would be connected to a recall. I believe there is a place on the MB national website where you can put in your VIN number and get a list of recalls.
As for software updates you can call any dealership, give them your VIN, and they can tell you if an update is available. I was recently at MB for the replacement service on the rear differential and checked for software updates on my 2014, 4matic but they indicated there were none.