On the early 722.6 transmission, there is a spring in the valve control body that can break and wind into itself. It is often in 2 or 3 pieces. The 2->3 flare is a sign of this often with no faults on the Star diagnosis. My 1997 G300td has this exact same issue and I am hoping to get the repair done in the next month or 2. Likely just an afternoon with a filter, gasket and a bottle or two of trans fluid. I have driven thousands of miles in Europe and USA with the 2-3 slip going on.
Get the Sonnax part, the MB spring mentioned in the thread below is incorrect. It is like only $2 or so.
Really cool G you have there. The 170K miles are not much. Should go at least 250K miles before major engine or axle issues.https://www.sonnax.com/parts/2313-regul ... lve-springhttps://www.benzworld.org/threads/722-6 ... t.1423078/