As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO IAD DUE TO FIRST OFFICER'S AIRSPEED INDICATION UNRELIABLE. AIRCRAFT LANDED SAFELY AT IAD WITHOUT FURTHER INCIDENT. REPLACED FIRST OFFICER'S PITOT TUBE PER AMM 34-11-01 (AALA202310234191) AND AIR DATA MODULE PER AMM 34-21-04 (AALA202310232497).