As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED CAPTAIN & FIRST OFFICER ALTITUDE & AIRSPEED DISAGREE. EMER DECLARED FLIGHT RETURNED & LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. REPLACED LT AIR DATA INERTIAL REFERENCE UNIT. SYS GND CHECKED NORMAL, OPERATION CLOSED.