Dozy,
Regarding the FAA's point on replacing the Rosemount units, I'd like to see the original document if anyone has a link handy.
Here is a link:
AIRBUS INDUSTRIE Model A300 Series Airplanes
The AD didn't mandate replacement of the Rosemount pitot tubes, just modification of the pitot probe heater within 1800 flight hours. This applied to the A-300 aircraft.