I had my transmission flushed and refilled at 7,700 mi with what I believe is a better fluid with which I have had significant experience. The flush also took care of most debris, if any, from mfg.
I just had my 2nd and last 'free' oil change at 13,300 mi, and sent samples of oil (2nd) and fluid (1st) to Blackstone last week.
My objectives are to get a low mileage baseline for the fluid and sample it every 3-4 engine oil changes in the future to see how it is holding up. As you are probably aware, the Manual specifies 45,000 mi fluid changes for severe duty (I don't tow or haul heavy loads) and there is NO recommendation otherwise.
For the engine oil, I want to monitor how the motor is setting in, and observe the performance of the Dexos2 5w30 insofar as soot, TBN and other parameters. I will do my own next oil change using an ACEA C3 2016 5W40 (also meets, but not certified Dexos2) to use for comparison both for oil analysis and observable differences in the Provent 200 oil drain, if any.
The tech I have used and specified in the past at Blackstone has been very helpful and informative.
Yes, the analyses now cost $30 +$10 ea for soot and TBN, but changing oil only twice a year is not a concern to me considering this truck is a planned long-term hold. Maybe later I will back off somewhat on the oil, but for now I want to learn from what the analysis has to offer.
Why not try a fluid analysis to see how it is holding up, esp. if you are severe service qualified?