Gear Shifting Problem: Mercedes-Benz E300 W212 (722.9 7G-Tronic) A Mercedes Benz E300 W212 equipped with the 722.9 (7G-Tronic) arrived with harsh/hesitant shifting under acceleration. An OE-level scan (XENTRY) showed multiple pressure-regulating valve electrical faults and two key DTCs: P2759 (TCC ...