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 DUE TO: AIRSPEED UNRELIABLE ON CLIMB OUT. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT STL. REMOVED AND REPLACED RIGHT HAND (ADIRU)-AIR DATA INERTIA REFERENCE UNIT. PER AMM 34-21-01.