As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE FROM FRA TO DEN AIRCRAFT DIVERTED TO LHR DUE TO VIBRATION ON THE RIGHT SIDE OF THE AIRPLANE. FOUND RT RAM AIR INLET DOOR FAILED RESULTING IN VIBRATION AND DAMAGE TO RAM AIR INLET DUCT. DOOR ASSY WAS REPLACED AND INLET DUCT WAS REPAIRED. A/C RETURNED TO REVENUE SERVICE WITHOUT FURTHER INCIDENT.