Just for information : I took my Freeo into the main dealer today. Told that the amber alarm was just a low level warning. Had there been something serious the alarm would indeed have been red. No mention of that in the owners handbook. The malfunction turned out to be related to the DPF. I was advised to drive for at least 25 minutes at at least 2,500 rpm to ensure that the particulates would be burn off ; 30 miles up the A1 in 4th gear on the way home followed. What indications would there be to show that the burn-off process had been successfully completed?