As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS ON CLIMB OUT PASSING ABOUT FL240 IN IMC, THE A/S DISAGREE AND ALT DISAGREE MESSAGES (FOS SIDE WAS WRONG FAILED LOW) CAME ON. WE WERE FLYING THROUGH ICING AS WELL. DESCENDING THROUGH 16,000. FIRST OFFICERS INSTRUMENTS RETURNED. MAINTENANCE REMOVED AND REPLACED THE RIGHT ADIRU IAW AMM 34-21-01. NO FURTHER FAULTS NOTED.