Expert S-Tronic repairs & maintenance at Regal Autosport. Restore smooth gear shifts & performance with professional DSG gearbox servicing. If you own a vehicle with an S-Tronic or DSG gearbox, you’ve probably heard a lot of things about the advanced transmissions. They’re known for offering smooth and efficient gear changes, but like any complex system, they can run into trouble over time. When that happens, S-tronic repairs become essential to keep your car running at its best.