On Friday evening I had the yellow air suspension fault light please contact workshop message. Over the weekend it has gradually dropped a little (it seems to do this normally when the temperature goes up and down a bit). Then when started this morning has the red message air suspension and says to stop.

AA couldn't find the exact cause but suggests that normal failure is the air compressor and maybe relay. Is this the most likely?

Does anyone know where is the compressor located on the car and can it be repaired? (google suggests earlier A6 model compressors can be repaired easily).