I have a 2017 Porsche Cayenne S which has a problem with the air suspension which is not working and Porsche said it will cost £4300 to put right. Porsche say the compressor and relay aree gone and need replacing however I was told by a friend that other garages can fit the part but it won't work until it's programmed into the car which only Porsche can do. Do you know if this is correct?