As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEG- ON FLIGHT 2323 SEA TO HLN AIRCRAFT DIVERTED TO GEG DUE TO NR 1 PFD ATTITUDE AND HEADING FAILURE AND ELEVATOR FEEL CAUTION LIGHT ILLUMINATED. AIRCRAFT LANDED SAFELY. REMOVED AND REPLACED NR 1 AHRU COMPUTER. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.