I Am posting this on behalf of a friend. I recently bought a Mercedes E63, 65 plate 14k miles (car was advertised on here). Long story short I have had the car couple of weeks and driven it myself around 400 miles just under 2 weeks ago I was going on a routine journey when the car broke down. The car started okay, however when I was driving the car it felt sluggish and alittle jerkey it felt like the power of the car was not going through the engine. Couple of miles into my journey I was waiting at the traffic lights when the car despite being on lost power, I would rev the car and nothing would happen. It was showing a couple of errors on the line of mercedes blind spot inoperative, presafe functions limited and there was another one which I cant remember but it was similiar to what I have listed. As the car is still in warranty I called out Mercedes breakdown after waiting over 3 and a half hours an RAC technician came out plugged his laptop and the car was showing a couple of P2725 error message which suggested an issue with the pressure control solenodi electrial module. There was nothing he could do to resolve the issue and the car had to be towed to my local Mercedes garage. The local Mercedes garge checked out the car, initial response I got was the control module might need replacing, I was then told this did not work. They then sent the readings from the gearbox to Germany who advised the gearbox valve body would need replacing. I was told the old gearbox will be sent back to Germany for them to investigate what caused the issue because apparently its not clear. I am still waiting for the new gearbox to be fiitted. I have made a complaint with Mercedes as I am not happy with the service I have recieved, I am hoping they can compensate by extending the warranty of the car or offer couple of a free services. Can anybody give any advice on how I can push for more? I have done a google search and havent seen similiar issues on a E63, has anybody else had a similiar issue or is this a one off?