First off, the dealership should hook up the tech2 and record all the parameters while the vehicle is doing the downshifting event. It could be nothing more than a reprogramming need and that will tell them if a shift solenoid is marginal.
Second, when you bring your vehicle in with a complaint under warranty and it comes back as a NTF(No Trouble Found) or "Could not Duplicate", that is entered into the GM database and can be accessed by any servicing dealer and will be considered if you go out of your warranty period if/when it fails.
Just keep your documents in the vehicle.
Dave
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1999 AMGeneral H1 6.5TD BLACK Wagon e-Lockers Front and Back, Rubberduck4x4 RockTubes, Extended Undercarriage Protection,"Big Duck" 2" body lift/2 1/2" suspension lift, 41" IROK Radials on 17" Cepeks w/Rock Rims, (in process)Centered front diff, 3.08 gears, 12k Brakes and 12k halfshafts
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