What was found
THE CREW REPORTED THAT ON DESCENT, A R ENG MTX MESSAGE APPEARED AND NP DECREASED. THE CREW FOLLOWED THE QRH AND RESET THE FADEC WITH NO CHANGE. THE ENGINE HAD A SELF SHUTDOWN SHORTLY AFTERWARD. THE ENGINE WAS RESTARTED PER THE QRH. THE R ENG MTX MESSAGE REMAINED ON FOR THE DURATION OF THE FLIGHT. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE RECALIBRATED THE NUMBER 2 BETA TUBE AFTER CONSULTING WITH ROLLS ROYCE. AN OPERATIONAL CHECK FLIGHT WAS SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.