Hi - the 5-speed auto box in my W211 E320 petrol e-class has an intermittent fault. When you start the car there is no gearbox info on the dashboard (ie. next to the mileage - no P, D, R etc and no S or W) and the trip-tronic selection doesn't work. The gearbox then stays in first gear. When you stop and switch off the engine, the gearbox will only go to Neutral, not Park. Start it up again and everything is OK. Last oil and filter change was 30,000 miles ago. Swith on side of gearbox was changed at last gearbox service. Car has done 145,000 miles. Any suggestions?