As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2801, FLL-LAX. 'ON TAKEOFF DURING FLAP RETRACTION ERRONEOUS "OVERSPEED" ECAM WARNING DETERMINED THAT THE BACKUP AIRSPEED INDICATOR WAS DISPLAYING 9KTS FASTER THAN CA/FO SPEEDS. NAV ADR3 FAULT EVENTUALLY DISPLAYED ON ECAM FOLLOWED QRH MSG STILL DISPLAYED; REMOVED AND REPLACED ADIRU #3 PER AMM 34-12-34 BITE TEST OK. NO FAULTS WERE PRESENT OR NOTED. A/C OK FOR SERVICE AT THIS TIME.'